TheClimateChanger Posted July 4, 2023 Share Posted July 4, 2023 15 minutes ago, TheClimateChanger said: On the whole, the 1800s were quite a bit colder. The official coldest yearly mean in Chicago history is 45.1F, from 1875. However, the mean temperature was 45F in 1855, 43F in 1856, 44F in 1857, 44.9F in 1860, 45.1 in 1862, 44.3F in 1863, 42.5F in 1864, and 44.3F in 1865, according to records published by the United States Weather Bureau in 1947. The normals for 1947, which at that time were based on the 50-year period from 1878-1927, adjusted to airport exposure, are given below. The normal temperature for December was 26.9F, for January 22.3F, for February 24.9F, and for March 34.5F. By comparison, the current normals for O'Hare are: December, 30.5F; January, 25.2F; February, 28.8F; and March, 39.0F. These values are 3.6F, 2.9F, 3.9F, and 4.5F warmer than the reported 1947 Midway norms. Chicago was also a bit drier in the past, particularly from April through August. The current normal is just shy of 5" more than the old MDW norms, with the bulk of the difference occurring in the warm season. I thought maybe it was because MDW is simply drier than ORD, but NowData shows a normal annual precipitation of 40.88" for MDW. Link to comment Share on other sites More sharing options...
Roger Smith Posted July 28, 2023 Share Posted July 28, 2023 Naturally interested in these data summaries, see my Toronto and New York City data analyses in the climate change forum here. If somebody can post links to all similar data for Chicago I could work up simiar tables. FWIW my urban heat island assessment for Toronto is an average increase of 1.1 C or 2.0 F occurring in 0.1 C increments per decade, starting with 1881-1890 when the city began to surround the location of the now-downtown (but originally edge of town) university campus location. Of course this is an average for different situations, a cool, dry month with a lot of clear nights would have a larger differential than a humid, wet month. I have applied the same set of adjustments to NYC data with the assumption that a larger heat island of 1.4 C began to appear before NYC data started in 1869. That makes the period 1869 to 1880 if unadjusted, 0.2 C warmer, and the first decade adjusted for Toronto 0.3 C warmer (1881-90). But as the data are only being ranked against each other, those additional adjustments make no difference to ranking outcomes. Is there a link to daily records, and if so, would ORD have incorporated older records from a different location? If not, is there a set of daily records that does span a longer interval? As it happens, it took only four days for Toronto to establish its first daily record (March 4th, 1840) that has somehow managed to persist to the present time. There are very few others on the warm side that lasted very long. One factor for Toronto is that a cooling lake breeze could more easily reach the location of the downtown weather station before the advent of multi-storey buildings around 1900. This wall of skyscrapers nowadays is a real inhibiting factor and the lake breeze tends to make better progress inland on either side of downtown Toronto. I suppose for Chicago the frequency of cooling lake breezes would be lower given the wind directions involved. Toronto is quite often in a south to east wind flow in spring anyway so the lake breeze is quite often a factor there. Link to comment Share on other sites More sharing options...
beavis1729 Posted July 30, 2023 Share Posted July 30, 2023 https://www.weather.gov/lot/observation_history ^ Here’s a link to the obs locations for Chicago weather records, back to the 1870s. Unfortunately the official site has changed a lot, so it’s hard to compare apples to apples over time. ORD is much different than downtown/lakeside, whether due to lake impacts or UHI (although the UHI at ORD keeps worsening over time). ORD has been the official site since 1980, even as ORD data goes back to 1959. 1 Link to comment Share on other sites More sharing options...
Chicago Storm Posted August 1, 2023 Author Share Posted August 1, 2023 July 2023 finished as the 7th wettest July on record for Chicago. Top 10 Wettest July's: 1. 11.15" - 2011 2. 9.56" - 1989 3. 8.98" - 1957 4. 8.84" - 2010 5. 8.33" - 1982 6. 7.68" - 20177. 7.61" - 2023 8. 7.58" - 1969 9. 7.31" - 1963 10. 7.18" - 1875 Link to comment Share on other sites More sharing options...
TheClimateChanger Posted August 2, 2023 Share Posted August 2, 2023 On 7/28/2023 at 3:20 PM, Roger Smith said: Naturally interested in these data summaries, see my Toronto and New York City data analyses in the climate change forum here. If somebody can post links to all similar data for Chicago I could work up simiar tables. FWIW my urban heat island assessment for Toronto is an average increase of 1.1 C or 2.0 F occurring in 0.1 C increments per decade, starting with 1881-1890 when the city began to surround the location of the now-downtown (but originally edge of town) university campus location. Of course this is an average for different situations, a cool, dry month with a lot of clear nights would have a larger differential than a humid, wet month. I have applied the same set of adjustments to NYC data with the assumption that a larger heat island of 1.4 C began to appear before NYC data started in 1869. That makes the period 1869 to 1880 if unadjusted, 0.2 C warmer, and the first decade adjusted for Toronto 0.3 C warmer (1881-90). But as the data are only being ranked against each other, those additional adjustments make no difference to ranking outcomes. Is there a link to daily records, and if so, would ORD have incorporated older records from a different location? If not, is there a set of daily records that does span a longer interval? As it happens, it took only four days for Toronto to establish its first daily record (March 4th, 1840) that has somehow managed to persist to the present time. There are very few others on the warm side that lasted very long. One factor for Toronto is that a cooling lake breeze could more easily reach the location of the downtown weather station before the advent of multi-storey buildings around 1900. This wall of skyscrapers nowadays is a real inhibiting factor and the lake breeze tends to make better progress inland on either side of downtown Toronto. I suppose for Chicago the frequency of cooling lake breezes would be lower given the wind directions involved. Toronto is quite often in a south to east wind flow in spring anyway so the lake breeze is quite often a factor there. You can always pull up the station histories from the monthly and annual weather reviews under Local Climatological Data (LCD) on the NCDC Image and Publication System: https://www.ncdc.noaa.gov/IPS/lcd/lcd.html These also tell exactly when the extreme thermometers were replaced with hygrothermometers, as well as the elevation of all of the instruments above ground level (and the elevation of the observation site above sea level). For example, here is the station history in the 1979 annual summary for MDW: And in the 1987 annual summary for ORD: Link to comment Share on other sites More sharing options...
TheClimateChanger Posted August 2, 2023 Share Posted August 2, 2023 On 7/28/2023 at 3:20 PM, Roger Smith said: Naturally interested in these data summaries, see my Toronto and New York City data analyses in the climate change forum here. If somebody can post links to all similar data for Chicago I could work up simiar tables. FWIW my urban heat island assessment for Toronto is an average increase of 1.1 C or 2.0 F occurring in 0.1 C increments per decade, starting with 1881-1890 when the city began to surround the location of the now-downtown (but originally edge of town) university campus location. Of course this is an average for different situations, a cool, dry month with a lot of clear nights would have a larger differential than a humid, wet month. I have applied the same set of adjustments to NYC data with the assumption that a larger heat island of 1.4 C began to appear before NYC data started in 1869. That makes the period 1869 to 1880 if unadjusted, 0.2 C warmer, and the first decade adjusted for Toronto 0.3 C warmer (1881-90). But as the data are only being ranked against each other, those additional adjustments make no difference to ranking outcomes. Is there a link to daily records, and if so, would ORD have incorporated older records from a different location? If not, is there a set of daily records that does span a longer interval? As it happens, it took only four days for Toronto to establish its first daily record (March 4th, 1840) that has somehow managed to persist to the present time. There are very few others on the warm side that lasted very long. One factor for Toronto is that a cooling lake breeze could more easily reach the location of the downtown weather station before the advent of multi-storey buildings around 1900. This wall of skyscrapers nowadays is a real inhibiting factor and the lake breeze tends to make better progress inland on either side of downtown Toronto. I suppose for Chicago the frequency of cooling lake breezes would be lower given the wind directions involved. Toronto is quite often in a south to east wind flow in spring anyway so the lake breeze is quite often a factor there. Unofficial data for the period 1830-1870 is available in the 1943 Annual Weather Review for MDW. It is based on records of the War Department at Fort Dearborn on Wacker Drive in present-day downtown Chicago, records of the Smithsonian Institution in various parts of the city, with some interpolation of missing data by other observations outside the city. Note that temperature means during this era were generally taken as the average of three measurements (typically 7am, 2pm, and 9pm), which tends to have a small warm bias compared to the average of maximum and minimum. This warm bias is most significant in the summertime. Recall this predates daylight saving time, and time zones, at least in the early part of that period. So these would have actually been observed after 8 am in the summertime [perhaps as late as 8:30, 8:45 if prior to standardized time zones], and would have been several degrees above the actual low. The inclusion of the 9 pm [actually equivalent to readings taken at 10 pm or later in the summertime during modern daylight saving time] reading somewhat mitigates this effect, but does not entirely eliminate it. 1 Link to comment Share on other sites More sharing options...
Roger Smith Posted August 2, 2023 Share Posted August 2, 2023 Those older Chicago area records seem to correlate well with Toronto back to 1840 and to some extent Providence RI back to 1832 (details on those sources are in my thread). For example April 1844 was a lot warmer than most other Aprils of that era. Winters 1855 to 1857 were all very cold for at least some portion (1856 more sustained). Winter 1841-42 was a very mild winter. I have some records copied out from some source for Fort Dearborn in the period 1782 to 1787. They show evidence of a very cold winter in 1783-84. The reversal of temperatures in winter 1857 from Jan (extreme cold) to Feb (record warm) came with severe ice jam flooding in many areas. It basically went from one extreme to another between Jan 22-24 and Feb 7-15. July 1868 was very hot in Toronto and with some adjustment for urban heat island in later data, is fairly close to being as hot as any later summer month. It was quite an outlier, as most other summers of the era were no warmer than what we might consider average. 1854 also had a rather hot summer. Link to comment Share on other sites More sharing options...
Chicago Storm Posted August 25, 2023 Author Share Posted August 25, 2023 Chicago/O'Hare had a high temperature of 98° yesterday (August 23rd), which broke the record high temperature for the date of 97°, which was set in 1947. Chicago/O'Hare had a low temperature of 77° on yesterday (August 23rd), which broke the record high minimum temperature for the date of 76°, which was set in 1968. Chicago/O'Hare had a high temperature of 100° today (August 24th), which tied the record high temperature for the date of 100°, which was set in 1947. 1 Link to comment Share on other sites More sharing options...
Chicago Storm Posted October 25, 2023 Author Share Posted October 25, 2023 Chicago/O'Hare had a high temperature of 83° today, which tied the record high temperature for the date of 83°, which was set in 1963. 4 Link to comment Share on other sites More sharing options...
Danny8 Posted October 27, 2023 Share Posted October 27, 2023 RECORD EVENT REPORTNATIONAL WEATHER SERVICE CHICAGO IL138 AM CDT FRI OCT 27 2023...RECORD HIGH MINIMUM TEMPERATURE SET AT CHICAGO-OHARE...A RECORD HIGH MINIMUM TEMPERATURE OF 65 WAS SET AT CHICAGO-OHARE YESTERDAY. THIS BEATS THE OLD RECORD OF 63 SET IN 1939. Link to comment Share on other sites More sharing options...
beavis1729 Posted October 27, 2023 Share Posted October 27, 2023 5 hours ago, Danny8 said: RECORD EVENT REPORTNATIONAL WEATHER SERVICE CHICAGO IL138 AM CDT FRI OCT 27 2023...RECORD HIGH MINIMUM TEMPERATURE SET AT CHICAGO-OHARE...A RECORD HIGH MINIMUM TEMPERATURE OF 65 WAS SET AT CHICAGO-OHARE YESTERDAY. THIS BEATS THE OLD RECORD OF 63 SET IN 1939. This was also the 3rd warmest min on record for so late in the season. Min was also 65 on 10/29/1946 and 10/31/1974. Highest min on record for November is 63. Link to comment Share on other sites More sharing options...
Chicago Storm Posted November 3, 2023 Author Share Posted November 3, 2023 October 2023 finished as the 10th snowiest October on record for Chicago. Top 10 Snowiest October's: 1. 6.3" - 1989 2. 4.6" - 2019 3. 4.4" - 1967 4. 3.0" - 1952 5. 2.2" - 1906 6. 1.9" - 1957 6. 1.9" - 1913 8. 1.3" - 1917 9. 1.2" - 192510. 0.9" - 2023 Link to comment Share on other sites More sharing options...
Chicago Storm Posted November 3, 2023 Author Share Posted November 3, 2023 Halloween 2023 finished as the 5th coldest and 2nd snowiest Halloween on record for Chicago. Top 10 Coldest Halloween's: 1. 31 - 1873 2. 32 - 1917 3. 33 - 2019 4. 37 - 18785. 38 - 2023 6. 39 - 1930 6. 39 - 1906 6. 39 - 1874 9. 40 - 2017 9. 40 - 1996 9. 40 - 1954 Top 10 Snowiest Halloween's: 1. 3.4" - 20192. 0.9" - 2023 3. 0.1" - 2014 4. T - 1993 4. T - 1955 4. T - 1926 4. T - 1918 4. T - 1917 Link to comment Share on other sites More sharing options...
Chicago Storm Posted December 20, 2023 Author Share Posted December 20, 2023 This thread may get some work soon…. 1 2 Link to comment Share on other sites More sharing options...
Chicago Storm Posted December 22, 2023 Author Share Posted December 22, 2023 A few stats to watch for on Christmas Eve and Christmas Day. Top 10, if not top 5, a lock for pretty much each list. Warmest Christmas Eve Max Temps 1. 64 - 1889 2. 62 - 1982 3. 59 - 1877 4. 58 - 1932 4. 58 - 1893 4. 58 - 1875 7. 57 - 2021 8. 55 - 2019 9. 54 - 1936 9. 54 - 1895 Warmest Christmas Eve Min Temps 1. 51 - 1982 2. 49 - 1877 3. 46 - 1893 3. 46 - 1889 5. 40 - 1888 6. 39 - 1931 7. 38 - 1932 8. 37 - 1979 8. 37 - 1875 Warmest Christmas Day Max Temps 1. 64 - 1982 2. 57 - 2019 3. 56 - 1936 3. 56 - 1895 5. 55 - 2021 5. 55 - 1971 7. 52 - 1994 7. 52 - 1893 7. 52 - 1891 10. 50 - 1940 10. 50 - 1877 Warmest Christmas Day Min Temps 1. 46 - 1936 2. 42 - 1940 2. 42 - 1877 4. 37 - 2019 5. 36 - 1982 6. 35 - 1957 6. 35 - 1941 6. 35 - 1888 6. 35 - 1881 10. 34 - 1973 10. 34 - 1923 10. 34 - 1913 10. 34 - 1891 Wettest Christmas Day 1. 0.50" - 1950 1. 0.50" - 1909 3. 0.47" - 1982 4. 0.46" - 2009 5. 0.38" - 1957 6. 0.35" - 1973 6. 0.35" - 1949 8. 0.34" - 1965 8. 0.34" - 1879 8. 0.34" - 1877 Link to comment Share on other sites More sharing options...
Chicago Storm Posted December 26, 2023 Author Share Posted December 26, 2023 As expected, cracked the top 10 or top 5 on every list... •Tied 8th warmest max temp on Christmas Eve. •3rd warmest min temp on Christmas Eve. •2nd warmest max temp on Christmas Day. •Warmest min temp on Christmas Day. •5th wettest Christmas Day. Top 10 Warmest Christmas Eve Max Temps 1. 64 - 1889 2. 62 - 1982 3. 59 - 1877 4. 58 - 1932 4. 58 - 1893 4. 58 - 1875 7. 57 - 20218. 55 - 2023 8. 55 - 2019 10. 54 - 1936 10. 54 - 1895 Top 10 Warmest Christmas Eve Min Temps 1. 51 - 1982 2. 49 - 18773. 48 - 2023 4. 46 - 1893 4. 46 - 1889 6. 40 - 1888 7. 39 - 1931 8. 38 - 1932 9. 37 - 1979 9. 37 - 1875 Top 10 Warmest Christmas Day Max Temps 1. 64 - 19822. 59 - 2023 3. 57 - 2019 4. 56 - 1936 4. 56 - 1895 6. 55 - 2021 6. 55 - 1971 8. 52 - 1994 8. 52 - 1893 8. 52 - 1891 Top 10 Warmest Christmas Day Min Temps1. 50 - 2023 2. 46 - 1936 3. 42 - 1940 3. 42 - 1877 4. 37 - 2019 6. 36 - 1982 7. 35 - 1957 7. 35 - 1941 7. 35 - 1888 7. 35 - 1881 Top 10 Wettest Christmas Day's 1. 0.50" - 1950 1. 0.50" - 1909 3. 0.47" - 1982 4. 0.46" - 20095. 0.39" - 2023 6. 0.38" - 1957 7. 0.35" - 1973 7. 0.35" - 1949 9. 0.34" - 1965 9. 0.34" - 1879 9. 0.34" - 1877 2 Link to comment Share on other sites More sharing options...
Chicago Storm Posted January 3 Author Share Posted January 3 December 2023 finished tied for the 4th warmest December on record. Top 10 Warmest December's 1. 43.4 - 1877 2. 40.7 - 1889 3. 39.7 - 19234. 39.0 - 2023 4. 39.0 - 2015 6. 38.4 - 1931 7. 38.0 - 2021 8. 37.8 - 1881 9. 37.7 - 1918 10. 37.4 - 1971 1 Link to comment Share on other sites More sharing options...
Chicago Storm Posted January 11 Author Share Posted January 11 Chicago/O'Hare received 0.93" of precipitation on January 9th, which broke the record precipitation total for the date of 0.76", which was set in 1946. Link to comment Share on other sites More sharing options...
Spartman Posted January 27 Share Posted January 27 On 2/1/2023 at 12:52 PM, Spartman said: It's official! Chicago has experienced its cloudiest January ever with only 18% of sunshine. The previous record was 20% of sunshine back in January 1998. https://wgntv.com/weather/tom-skilling/skilling-just-how-cloudy-and-cold-was-january/ Last year, Chicago had its cloudiest January on record. This January doesn't seem to be an improvement from 2023. January 2023: 000 CXUS53 KLOT 011748 CF6ORD PRELIMINARY LOCAL CLIMATOLOGICAL DATA (WS FORM: F-6) STATION: CHICAGO-OHARE MONTH: JANUARY YEAR: 2023 LATITUDE: 41 58 N LONGITUDE: 87 54 W TEMPERATURE IN F: :PCPN: SNOW: WIND :SUNSHINE: SKY :PK WND ================================================================================ 1 2 3 4 5 6A 6B 7 8 9 10 11 12 13 14 15 16 17 18 12Z AVG MX 2MIN DY MAX MIN AVG DEP HDD CDD WTR SNW DPTH SPD SPD DIR MIN PSBL S-S WX SPD DR ================================================================================ 1 45 37 41 14 24 0 0.16 0.0 0 3.9 12 240 M M 10 128 14 220 2 43 32 38 11 27 0 0.00 0.0 0 6.5 15 50 M M 9 12 20 60 3 48 39 44 18 21 0 1.12 T 0 7.6 17 60 M M 10 1235 22 50 4 44 33 39 13 26 0 T 0.0 0 8.2 15 230 M M 9 1 21 240 5 34 32 33 7 32 0 0.02 0.2 0 8.5 15 250 M M 10 1 20 260 6 34 25 30 4 35 0 T T 0 6.9 14 230 M M 10 1 18 230 7 32 27 30 4 35 0 0.00 0.0 0 5.8 13 50 M M 10 8 18 50 8 33 26 30 4 35 0 0.00 0.0 0 4.9 13 280 M M 10 1 19 300 9 44 25 35 9 30 0 0.00 0.0 0 8.4 15 210 M M 6 18 23 220 10 50 34 42 17 23 0 0.00 0.0 0 4.9 12 160 M M 6 8 16 160 11 57 38 48 23 17 0 0.00 0.0 0 3.4 15 150 M M 9 18 19 160 12 43 36 40 15 25 0 T T 0 14.4 28 360 M M 10 128 35 360 13 36 26 31 6 34 0 0.02 0.2 0 14.3 23 360 M M 10 1 30 10 14 31 24 28 3 37 0 T T 0 7.4 14 170 M M 9 18 160 15 44 26 35 10 30 0 0.00 0.0 0 12.9 21 160 M M 8 30 160 16 52 40 46 21 19 0 0.18 0.0 0 13.8 21 240 M M 10 1 32 240 17 49 37 43 18 22 0 0.00 0.0 0 14.7 24 250 M M 10 18 34 240 18 41 36 39 14 26 0 0.24 T 0 10.7 28 100 M M 10 14 39 90 19 42 34 38 13 27 0 0.14 T 0 8.8 20 280 M M 10 18 29 290 20 35 29 32 7 33 0 T T 0 10.7 17 300 M M 10 1 25 280 21 32 28 30 6 35 0 0.00 0.0 0 7.8 15 200 M M 10 19 210 22 34 26 30 6 35 0 0.13 1.5 1 4.9 13 350 M M 10 1 17 50 23 30 21 26 2 39 0 T T 0 12.0 21 250 M M 9 156 31 210 24 36 28 32 8 33 0 0.00 0.0 0 6.3 15 280 M M 10 21 250 25 34 31 33 8 32 0 0.30 3.6 2 8.3 14 320 M M 10 18 21 350 26 32 15 24 -1 41 0 0.04 0.8 2 10.4 20 250 M M 10 1 26 240 27 36 13 25 0 40 0 0.06 0.8 2 15.3 26 260 M M 6 129 41 250 28 31 19 25 0 40 0 0.15 2.2 1 8.3 17 70 M M 9 146 24 60 29 31 18 25 0 40 0 0.02 0.2 3 10.8 20 350 M M 10 146 24 350 30 18 5 12 -13 53 0 0.02 0.4 3 9.7 15 310 M M 7 21 320 31 12 -1 6 -19 59 0 0.00 0.0 3 6.1 13 260 M M 2 18 250 ================================================================================ SM 1163 839 1005 0 2.60 9.9 276.6 M 279 ================================================================================ AV 37.5 27.1 8.9 FASTST M M 9 MAX(MPH) MISC ----> # 28 360 41 250 ================================================================================ NOTES: # LAST OF SEVERAL OCCURRENCES COLUMN 17 PEAK WIND IN M.P.H. PRELIMINARY LOCAL CLIMATOLOGICAL DATA (WS FORM: F-6) , PAGE 2 STATION: CHICAGO-OHARE MONTH: JANUARY YEAR: 2023 LATITUDE: 41 58 N LONGITUDE: 87 54 W [TEMPERATURE DATA] [PRECIPITATION DATA] SYMBOLS USED IN COLUMN 16 AVERAGE MONTHLY: 32.3 TOTAL FOR MONTH: 2.60 1 = FOG OR MIST DPTR FM NORMAL: 7.1 DPTR FM NORMAL: 0.61 2 = FOG REDUCING VISIBILITY HIGHEST: 57 ON 11 GRTST 24HR 1.12 ON 3- 3 TO 1/4 MILE OR LESS LOWEST: -1 ON 31 3 = THUNDER SNOW, ICE PELLETS, HAIL 4 = ICE PELLETS TOTAL MONTH: 9.9 INCHES 5 = HAIL GRTST 24HR 3.6 ON 25-25 6 = FREEZING RAIN OR DRIZZLE GRTST DEPTH: 3 ON 31,30 7 = DUSTSTORM OR SANDSTORM: VSBY 1/2 MILE OR LESS 8 = SMOKE OR HAZE [NO. OF DAYS WITH] [WEATHER - DAYS WITH] 9 = BLOWING SNOW X = TORNADO MAX 32 OR BELOW: 9 0.01 INCH OR MORE: 14 MAX 90 OR ABOVE: 0 0.10 INCH OR MORE: 8 MIN 32 OR BELOW: 21 0.50 INCH OR MORE: 1 MIN 0 OR BELOW: 1 1.00 INCH OR MORE: 1 [HDD (BASE 65) ] TOTAL THIS MO. 1005 CLEAR (SCALE 0-3) 1 DPTR FM NORMAL -229 PTCLDY (SCALE 4-7) 5 TOTAL FM JUL 1 3171 CLOUDY (SCALE 8-10) 25 DPTR FM NORMAL -277 [CDD (BASE 65) ] TOTAL THIS MO. 0 DPTR FM NORMAL 0 [PRESSURE DATA] TOTAL FM JAN 1 0 HIGHEST SLP 30.49 ON 31 DPTR FM NORMAL 0 LOWEST SLP 29.43 ON 19 [REMARKS] #FINAL-01-23# This January (to date): 000 CXUS53 KLOT 270800 CF6ORD PRELIMINARY LOCAL CLIMATOLOGICAL DATA (WS FORM: F-6) STATION: CHICAGO-OHARE MONTH: JANUARY YEAR: 2024 LATITUDE: 41 58 N LONGITUDE: 87 54 W TEMPERATURE IN F: :PCPN: SNOW: WIND :SUNSHINE: SKY :PK WND ================================================================================ 1 2 3 4 5 6A 6B 7 8 9 10 11 12 13 14 15 16 17 18 12Z AVG MX 2MIN DY MAX MIN AVG DEP HDD CDD WTR SNW DPTH SPD SPD DIR MIN PSBL S-S WX SPD DR ================================================================================ 1 32 27 30 3 35 0 T T 0 10.1 18 340 M M 10 25 240 2 39 26 33 6 32 0 T T 0 12.0 22 230 M M 8 18 30 210 3 36 31 34 8 31 0 T T 0 7.2 14 300 M M 10 16 18 350 4 37 24 31 5 34 0 0.00 0.0 0 4.8 16 350 M M 6 20 350 5 37 26 32 6 33 0 0.01 0.1 0 6.6 13 120 M M 8 1 17 120 6 34 31 33 7 32 0 0.21 2.6 2 4.3 10 110 M M 10 14 14 110 7 34 31 33 7 32 0 0.02 0.8 3 7.9 14 260 M M 10 18 19 280 8 36 30 33 7 32 0 0.08 0.4 1 8.9 18 100 M M 10 1 24 100 9 36 33 35 9 30 0 0.93 2.8 1 13.2 23 310 M M 10 124 34 320 10 34 30 32 7 33 0 T 0.1 2 12.0 23 310 M M 10 1 33 310 11 34 27 31 6 34 0 0.01 0.3 2 8.2 22 270 M M 9 18 30 260 12 36 30 33 8 32 0 0.77 4.7 2 13.4 37 90 M M 10 1248 55 90 13 33 1 17 -8 48 0 0.09 2.4 5 16.5 28 260 M M 10 19 39 260 14 3 -10 -3 -28 68 0 T T 4 16.2 26 270 M M 5 89 40 280 15 2 -10 -4 -29 69 0 0.00 0.0 4 10.9 16 260 M M 7 24 260 16 3 -7 -2 -27 67 0 0.00 0.0 4 16.0 24 240 M M 3 34 240 17 20 2 11 -14 54 0 0.00 0.0 4 12.9 22 230 M M 7 30 230 18 28 12 20 -5 45 0 0.06 0.8 4 6.4 16 340 M M 9 1 22 340 19 14 5 10 -15 55 0 0.04 1.1 5 14.0 20 320 M M 9 18 27 320 20 18 4 11 -14 54 0 0.00 0.0 4 9.9 15 310 M M 3 21 320 21 21 1 11 -13 54 0 0.00 0.0 4 9.8 20 190 M M 5 27 200 22 34 21 28 4 37 0 0.03 T 4 11.3 21 220 M M 10 1456 31 200 23 37 33 35 11 30 0 0.36 0.0 4 3.7 9 100 M M 10 16 14 20 24 38 34 36 12 29 0 0.18 0.0 3 5.9 12 40 M M 10 12 20 10 25 38 35 37 12 28 0 0.28 0.0 1 9.0 16 20 M M 10 12 26 40 26 40 37 39 14 26 0 0.38 0.0 0 5.9 16 20 M M 10 1 21 30 ================================================================================ SM 754 504 1054 0 3.45 16.1 257.0 M 219 ================================================================================ AV 29.0 19.4 9.9 FASTST M M 8 MAX(MPH) MISC ----> 37 90 55 90 ================================================================================ NOTES: # LAST OF SEVERAL OCCURRENCES COLUMN 17 PEAK WIND IN M.P.H. PRELIMINARY LOCAL CLIMATOLOGICAL DATA (WS FORM: F-6) , PAGE 2 STATION: CHICAGO-OHARE MONTH: JANUARY YEAR: 2024 LATITUDE: 41 58 N LONGITUDE: 87 54 W [TEMPERATURE DATA] [PRECIPITATION DATA] SYMBOLS USED IN COLUMN 16 AVERAGE MONTHLY: 24.2 TOTAL FOR MONTH: 3.45 1 = FOG OR MIST DPTR FM NORMAL: -1.1 DPTR FM NORMAL: 1.74 2 = FOG REDUCING VISIBILITY HIGHEST: 40 ON 26 GRTST 24HR 0.93 ON 9- 9 TO 1/4 MILE OR LESS LOWEST: -10 ON 15,14 3 = THUNDER SNOW, ICE PELLETS, HAIL 4 = ICE PELLETS TOTAL MONTH: 17.0 INCHES 5 = HAIL GRTST 24HR 4.7 ON 12-12 6 = FREEZING RAIN OR DRIZZLE GRTST DEPTH: 5 ON 19,13 7 = DUSTSTORM OR SANDSTORM: VSBY 1/2 MILE OR LESS 8 = SMOKE OR HAZE [NO. OF DAYS WITH] [WEATHER - DAYS WITH] 9 = BLOWING SNOW X = TORNADO MAX 32 OR BELOW: 9 0.01 INCH OR MORE: 15 MAX 90 OR ABOVE: 0 0.10 INCH OR MORE: 7 MIN 32 OR BELOW: 21 0.50 INCH OR MORE: 2 MIN 0 OR BELOW: 3 1.00 INCH OR MORE: 0 [HDD (BASE 65) ] TOTAL THIS MO. 1054 CLEAR (SCALE 0-3) 1 DPTR FM NORMAL 26 PTCLDY (SCALE 4-7) 8 TOTAL FM JUL 1 2816 CLOUDY (SCALE 8-10) 17 DPTR FM NORMAL -432 [CDD (BASE 65) ] TOTAL THIS MO. 0 DPTR FM NORMAL 0 [PRESSURE DATA] TOTAL FM JAN 1 0 HIGHEST SLP M ON M DPTR FM NORMAL 0 LOWEST SLP 28.96 ON 9 [REMARKS] Just for fun, January 2020: 173 CXUS55 KLOT 010700 CF6ORD PRELIMINARY LOCAL CLIMATOLOGICAL DATA (WS FORM: F-6) STATION: CHICAGO-OHARE MONTH: JANUARY YEAR: 2020 LATITUDE: 41 58 N LONGITUDE: 87 54 W TEMPERATURE IN F: :PCPN: SNOW: WIND :SUNSHINE: SKY :PK WND ================================================================================ 1 2 3 4 5 6A 6B 7 8 9 10 11 12 13 14 15 16 17 18 12Z AVG MX 2MIN DY MAX MIN AVG DEP HDD CDD WTR SNW DPTH SPD SPD DIR MIN PSBL S-S WX SPD DR ================================================================================ 1 42 21 32 8 33 0 0.00 0.0 0 11.9 22 190 M M 3 34 190 2 48 37 43 19 22 0 0.00 0.0 0 11.7 22 190 M M 5 32 190 3 41 33 37 13 28 0 0.00 0.0 0 6.1 12 330 M M 10 14 350 4 33 26 30 6 35 0 0.03 0.5 1 9.2 16 310 M M 10 18 24 300 5 42 24 33 9 32 0 0.00 0.0 0 13.8 26 280 M M 8 37 220 6 42 27 35 11 30 0 0.00 0.0 0 9.5 16 260 M M 5 24 270 7 40 28 34 10 31 0 0.00 0.0 0 10.7 20 270 M M 7 30 270 8 29 14 22 -2 43 0 0.00 0.0 0 11.2 23 300 M M 4 32 300 9 50 23 37 13 28 0 0.02 0.0 0 16.1 26 200 M M 9 39 200 10 50 36 43 19 22 0 0.84 0.0 0 11.4 26 20 M M 10 12 34 30 11 37 25 31 7 34 0 0.37 2.1 0 25.0 39 20 M M 10 129 52 10 12 31 23 27 3 38 0 T T 2 6.5 16 150 M M 10 168 22 160 13 33 31 32 8 33 0 T 0.2 2 8.3 20 270 M M 8 1 26 280 14 39 25 32 8 33 0 0.00 0.0 1 8.5 22 240 M M 8 1 29 230 15 36 25 31 7 34 0 T 0.0 0 8.0 22 320 M M 8 1 31 290 16 29 11 20 -4 45 0 T T 0 11.7 22 310 M M 6 29 290 17 29 11 20 -3 45 0 0.37 3.1 0 10.5 25 120 M M 10 12469 34 120 18 35 5 20 -3 45 0 0.40 T 2 15.8 31 270 M M 9 168 46 270 19 19 2 11 -12 54 0 T T 2 13.0 26 260 M M 7 39 280 20 31 17 24 1 41 0 T T 2 6.8 12 310 M M 6 15 310 21 29 15 22 -2 43 0 0.00 0.0 2 7.7 17 230 M M 3 24 230 22 34 24 29 5 36 0 T T 2 12.2 18 180 M M 10 29 190 23 34 29 32 8 33 0 0.17 0.9 2 7.6 15 190 M M 10 1 22 180 24 37 32 35 11 30 0 0.40 T 1 4.7 13 80 M M 10 12 17 80 25 34 32 33 9 32 0 0.12 0.4 1 8.2 15 260 M M 10 16 21 230 26 33 27 30 6 35 0 T T 1 9.3 15 230 M M 10 1 20 250 27 35 27 31 7 34 0 T T 0 5.8 9 340 M M 10 16 12 270 28 33 31 32 8 33 0 T T 0 5.8 12 300 M M 10 1 17 300 29 34 30 32 8 33 0 T T 0 4.7 9 20 M M 10 8 11 20 30 35 32 34 10 31 0 0.00 0.0 0 3.6 9 170 M M 10 8 14 190 31 37 32 35 11 30 0 0.08 0.6 0 5.3 10 170 M M 10 18 14 160 ================================================================================ SM 1111 755 1076 0 2.80 7.8 300.6 M 256 ================================================================================ AV 35.8 24.4 9.7 FASTST M M 8 MAX(MPH) MISC ----> # 39 20 # 52 10 ================================================================================ NOTES: # LAST OF SEVERAL OCCURRENCES COLUMN 17 PEAK WIND IN M.P.H. PRELIMINARY LOCAL CLIMATOLOGICAL DATA (WS FORM: F-6) , PAGE 2 STATION: CHICAGO-OHARE MONTH: JANUARY YEAR: 2020 LATITUDE: 41 58 N LONGITUDE: 87 54 W [TEMPERATURE DATA] [PRECIPITATION DATA] SYMBOLS USED IN COLUMN 16 AVERAGE MONTHLY: 30.1 TOTAL FOR MONTH: 2.80 1 = FOG OR MIST DPTR FM NORMAL: 6.3 DPTR FM NORMAL: 1.07 2 = FOG REDUCING VISIBILITY HIGHEST: 50 ON 10, 9 GRTST 24HR 0.84 ON 10-10 TO 1/4 MILE OR LESS LOWEST: 2 ON 19 3 = THUNDER SNOW, ICE PELLETS, HAIL 4 = ICE PELLETS TOTAL MONTH: 7.8 INCHES 5 = HAIL GRTST 24HR 3.1 ON 17-17 6 = FREEZING RAIN OR DRIZZLE GRTST DEPTH: 2 ON 23,22 7 = DUSTSTORM OR SANDSTORM: VSBY 1/2 MILE OR LESS 8 = SMOKE OR HAZE [NO. OF DAYS WITH] [WEATHER - DAYS WITH] 9 = BLOWING SNOW X = TORNADO MAX 32 OR BELOW: 7 0.01 INCH OR MORE: 10 MAX 90 OR ABOVE: 0 0.10 INCH OR MORE: 7 MIN 32 OR BELOW: 28 0.50 INCH OR MORE: 1 MIN 0 OR BELOW: 0 1.00 INCH OR MORE: 0 [HDD (BASE 65) ] TOTAL THIS MO. 1076 CLEAR (SCALE 0-3) 1 DPTR FM NORMAL -203 PTCLDY (SCALE 4-7) 12 TOTAL FM JUL 1 3384 CLOUDY (SCALE 8-10) 18 DPTR FM NORMAL -306 [CDD (BASE 65) ] TOTAL THIS MO. 0 DPTR FM NORMAL 0 [PRESSURE DATA] TOTAL FM JAN 1 0 HIGHEST SLP M ON M DPTR FM NORMAL 0 LOWEST SLP 29.31 ON 31 [REMARKS] #FINAL-01-20# Link to comment Share on other sites More sharing options...
Spartman Posted January 30 Share Posted January 30 According to Tom Skilling, because the sun came back in Chicago on Monday, Chicago's overcast stretch ended at 7 consecutive days that matched an exact stretch occurring just last year and in 1998. If the sun didn't return Monday, Chicago's overcast stretch would've been 8 consecutive days and counting.https://www.facebook.com/TomSkilling/posts/pfbid031tqr8jNe5QjMt8uq1549gSjkkTRUrF8tBHZ69iQAfCFxYJxegKxenAKX68s2JbMvl?__cft__[0]=AZWO58oiJkSoGVRunLpBslVBng0oTlhJvKJ8OumpAFruN4ouoUc0wXtDDVjgXNnTMPaOhuyri-tkLAJ5lEZdO6Xu-_q49LiJwMdgvbu4a8dGhXH-ugW8CCL80ZeliPHK8cvMqqa09lEMeiKQX1wLMfszq859KPjkLdLmDDgvPckayAUszEU__TeXIUM0Gweyo_Y&__tn__=%2CO%2CP-R Link to comment Share on other sites More sharing options...
Chicago Storm Posted February 12 Author Share Posted February 12 Chicago/O'Hare had a high temperature of 56° on February 9th, which tied the record high max temperature for the date of 56°, which was set in 1886. Link to comment Share on other sites More sharing options...
Chicago Storm Posted February 15 Author Share Posted February 15 I’ve been waiting to hit mid-month, and now that we have, this thread is about to get cookin’… Link to comment Share on other sites More sharing options...
Chicago Storm Posted February 19 Author Share Posted February 19 Several things to watch as we head towards the conclusion of February... Warmest February's 1. 39.0° - 1882 2. 38.7° - 1998 3. 38.0° - 2017 4. 37.5° - 1954 5. 37.3° - 1877 6. 37.1° - 19307. 36.6° - 2024 (Thru 2/18) 8. 36.5° - 1878 9. 35.8° - 1976 10. 35.6° - 1931 Least Snowy February's1. T - 2024 (Thru 2/18) 1. T - 2017 1. T - 1998 1. T - 1987 5. 0.3" - 1996 5. 0.3" - 1921 7. 0.4" - 1995 8. 0.4" - 1931 9. 0.5" - 1915 10. 0.9" - 1922 Driest February's 1. 0.06" - 18772. 0.10" - 2024 (Thru 2/18) 3. 0.13" - 1920 4. 0.19" - 2003 5. 0.25" - 1969 6. 0.33" - 1958 7. 0.38" - 1947 7. 0.38" - 1921 9. 0.41" - 1995 9. 0.41" - 1982 1 Link to comment Share on other sites More sharing options...
mimillman Posted February 19 Share Posted February 19 Gotta think we make a run for top 3 in both warmest and least snowy categories. Link to comment Share on other sites More sharing options...
mimillman Posted February 21 Share Posted February 21 Yea this is gonna be shattered Link to comment Share on other sites More sharing options...
Chicago Storm Posted February 23 Author Share Posted February 23 A tie for the least snowiest February is in serious jeopardy this evening/tonight. Luckily, I'm working... 1 Link to comment Share on other sites More sharing options...
mimillman Posted February 23 Share Posted February 23 48 minutes ago, Chicago Storm said: A tie for the least snowiest February is in serious jeopardy this evening/tonight. Luckily, I'm working... we should still get warmest or near there I imagine Link to comment Share on other sites More sharing options...
Chicago Storm Posted February 23 Author Share Posted February 23 2 hours ago, mimillman said: we should still get warmest or near there I imagine Running the numbers just roughly off of the NWS forecast (Likely underdone a bit early next week), we are in the running for the top 5 warmest, but not close to 1st. We would need temps to overperform their current forecast by quite a bit to make a run at the record warmest. Link to comment Share on other sites More sharing options...
Chicago Storm Posted February 24 Author Share Posted February 24 3 hours ago, Chicago Storm said: A tie for the least snowiest February is in serious jeopardy this evening/tonight. Luckily, I'm working... And just like that... We are not only out of the running for least snowy February on record, but we are out of the running for top 5 least snowy as well. Link to comment Share on other sites More sharing options...
Stebo Posted February 24 Share Posted February 24 33 minutes ago, Chicago Storm said: And just like that, we are not only out of the running for least snowy February on record, but we are out of the running for top 5 least snowy as well. Rip Link to comment Share on other sites More sharing options...
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