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October 2023 General Discussion


Chambana
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Reached 95F at Spencer and Oskaloosa, Iowa, just a couple degrees below the statewide record high of 97F for the month of October, set on October 3, 1938, at Onawa; October 4, 1938, at Knoxville; and October 5, 1963, at Forest City and Shenandoah.

The high of 95F at Spencer, broke the daily record by 4F, and also eclipsed the prior monthly record of 93F, set on October 2, 1997 and October 5, 1963. Spencer has now reached 95F or better on three consecutive days. Looking through the records, the latest stretch of 3 consecutive days at or above 95F, was September 12-15, 1939, when it exceeded that mark on 4 consecutive days.

It also looks like last year had some notable late season heat at Spencer, Iowa. It reached 101F on September 20, 2022, which was the latest 100F reading on record by a week. The prior record was 100F on September 13, 1939, during the aforementioned 4-day stretch of extreme heat. That reading is the only other reading of 100F or better after September 4th. Records at Spencer date to 1895.

 

 

 

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Some other noteworthy readings from Iowa, from sites with threaded records dating back to the 19th century.

It reached 91F at Cedar Rapids, setting a daily record. This is only the 11th day on record in the month of October to reach or exceed 90F, and the first since October 3, 2006. Only three days were hotter - 94F on October 3, 1997; and 92F on October 2, 1953, and on October 6, 1963.

Waterloo, Iowa reached 93F, setting a daily record. Only three days in the month of October have been hotter - 95F on October 3, 1997; October 6, 1963; and October 12, 1930. It was also the first time it has reached or exceeded 90F in the month of October since the 95F reading on October 3, 1997.

Des Moines reached 91F, one shy of the daily record. However, it was only the 13th day in the month of October to reach or exceed 90F, and the first since it reached 92F on October 3, 1997.

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3 hours ago, OrdIowPitMsp said:

It reached 91 in Minneapolis today. This is the warmest October temperature on record. It had previously gotten to 90 twice in October in 1997 and 1928.

Minneapolis actually reached 92F today, which as noted is the new monthly record, and only the third reading at or above 90F in the month of October. Prior to today, the latest date in the calendar year on which it reached or exceed 92F was September 22nd, when it reached 95F in 1936 & 94F in 2017.

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Some other notable records from Minnesota.

91F, at St. Cloud, is a new daily and monthly record. The prior monthly record was 90F, set on October 2, in 1992 & 1953. Prior to today, the latest day to exceed (not just reach) 90F was September 22, 1936, when it reached 92F.

89F, at Brainerd, is a new daily and monthly record. The prior monthly record was 88F, set on October 2, 1992. Brainerd has been no stranger to anomalous, out-of-season heat in recent times. Just last month, it reached 102F on September 3rd, which was only the 2nd time it has reached into the triple digits in the month of September, and was just 1F shy of the September monthly record of 103F, set on September 10, 1931. Brainerd hit 100F on June 4, 2021, and on June 20, 2022, which are two of only three 100+ days in the month of June (the other being the 100F reading on June 19, 1988). The only earlier 100F+ was May 31, 1934.

83F, at International Falls, tied the daily record but was well shy of the monthly mark. Still only 5 days in the month of October have eclipsed that reading - 87F, on October 2, 1912; 86F on October 2, 1953; 88 on October 5, 1963; 84F on October 5, 1970; and 88F on October 11, 2015.

90F, at Rochester, set a new daily record but was a few degrees shy of the monthly record. Still it was one of only four 90F+ days ever observed in the month of October - the others being 93F on October 3, 1997, and 90F on October 2, 1953, and October 9, 2010. It is the latest in the year for two consecutive 90F or better readings, however.

Wisconsin also had some notable readings. The 88F reading at Green Bay tied the monthly record set on October 6, 1963. LaCrosse reached 91F, which while 1F below the daily record, is notable as only the 4th 90F+ reading on record there.

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3 hours ago, hardypalmguy said:

MKE probably would have tagged 90 today for warmest October day ever if lake breeze didn’t kick in. Oh well. Registered 85 on my PWS so definitely top shelf October day. Definitely still palm tree weather.

Going to have to agree with you here. Absolutely gorgeous here today with the high only at 84 here at KIND. We are going to pay for this sometime before this month is out though. Not looking forward to that.

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Minneapolis has done quite well in the heat department for the end of summer and early autumn.

August

A significant heat wave in late August brought numerous hourly monthly heat index records. Hourly data only going back to 1945 - all from MSP.

image.thumb.png.fdd223896aa86cf9a9d7c8e409bd0376.png

It was only the 4th year to have multiple days at or above 98F in the month of August:

image.png.ce0f82ca068c4b8e6f1f27d7d14d59a1.png

The low of 79F on August 23rd was the 6th highest on record, missing the monthly record of 80F (which has been set 5 times) by 1F.

image.png.099339df7311f5265b0f99ecf2f5f376.png


The mean temperature of 88.5F on the 23rd was the 4th highest ever observed on any day in the month of August (chart below lists third, but there were two instances of 89.0F in 1947). The only higher are 89.5F, on 8/6/2001, and 89.0F, on August 4, 1947 & August 5, 1947.

image.png.32881c74e8e41af07120d18d9d88d61c.png

September

September 2023 was one of only 6 years to have 2 days at or above 97F, in the threaded record. It was the first time that has occurred since 1939.

image.png.f2ad3bb3356d1de7a27c51510c468f55.png

It was also one of only 6 years to reach or exceed 98F in the month of September, and the first time that value has been reached since 1976.

image.png.3c71ddfc37899e5e37640497a7ce8c54.png

The daily mean of 86.0F on the 3rd and the 4th tied for 3rd highest daily mean ever observed in the month of September in the threaded record (chart below lists third, but there were two instances with a warmer daily mean in 1931).

image.png.361120e38bb9ef92825662b1cc55ff28.png

The low of 75F on September 3rd tied for 4th highest observed, and tied 2002 & 2015 as the highest since 1953. The only higher minima were 77F on September 5, 1912 & 76F on September 2, 1953 & September 9, 1931.

image.png.4f68455f509b5d7b9249ef47ef08d083.png

Looking at hourly temperature readings at MSP back to 1945, 16 hours set or tied the highest observed in the month of September. 

image.thumb.png.23ed1db823b0c0e2b424a3e75dc60d97.png

October

The high of 92F on the 1st is the highest maximum temperature ever observed in the month of October. It was also only the third occasion where the temperature has reached 90F in the month of October.

image.png.e86d14d9303b3d731a26a1e0e791770f.png

The low of 69F on the 1st tied for 4th highest ever observed in the month of October, behind October 8, 2011 (71F), October 6, 2007 (70F), and October 3, 2005 (72F).

image.png.424caab84c65e71380ada051c30902c6.png

The mean temperature of 80.5F on the 1st broke the monthly record by 2F:

image.png.4438afb0eb89991c9f98d3218154b3ca.png

9 of 24 hourly temperature records for the month of October (since 1945) were set yesterday:

image.thumb.png.2a7aa66f8637bdd9295bebc8ab6d14db.png

 

 

image.png

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Minneapolis has done quite well in the heat department for the end of summer and early autumn.
August
A significant heat wave in late August brought numerous hourly monthly heat index records. Hourly data only going back to 1945 - all from MSP.
image.thumb.png.fdd223896aa86cf9a9d7c8e409bd0376.png
It was only the 4th year to have multiple days at or above 98F in the month of August:
image.png.ce0f82ca068c4b8e6f1f27d7d14d59a1.png
The low of 79F on August 23rd was the 6th highest on record, missing the monthly record of 80F (which has been set 5 times) by 1F.
image.png.099339df7311f5265b0f99ecf2f5f376.png

The mean temperature of 88.5F on the 23rd was the 4th highest ever observed on any day in the month of August (chart below lists third, but there were two instances of 89.0F in 1947). The only higher are 89.5F, on 8/6/2001, and 89.0F, on August 4, 1947 & August 5, 1947.
image.png.32881c74e8e41af07120d18d9d88d61c.png
September
September 2023 was one of only 6 years to have 2 days at or above 97F, in the threaded record. It was the first time that has occurred since 1939.
image.png.f2ad3bb3356d1de7a27c51510c468f55.png
It was also one of only 6 years to reach or exceed 98F in the month of September, and the first time that value has been reached since 1976.
image.png.3c71ddfc37899e5e37640497a7ce8c54.png
The daily mean of 86.0F on the 3rd and the 4th tied for 3rd highest daily mean ever observed in the month of September in the threaded record (chart below lists third, but there were two instances with a warmer daily mean in 1931).
image.png.361120e38bb9ef92825662b1cc55ff28.png
The low of 75F on September 3rd tied for 4th highest observed, and tied 2002 & 2015 as the highest since 1953. The only higher minima were 77F on September 5, 1912 & 76F on September 2, 1953 & September 9, 1931.
image.png.4f68455f509b5d7b9249ef47ef08d083.png
Looking at hourly temperature readings at MSP back to 1945, 16 hours set or tied the highest observed in the month of September. 
image.thumb.png.23ed1db823b0c0e2b424a3e75dc60d97.png
October
The high of 92F on the 1st is the highest maximum temperature ever observed in the month of October. It was also only the third occasion where the temperature has reached 90F in the month of October.
image.png.e86d14d9303b3d731a26a1e0e791770f.png
The low of 69F on the 1st tied for 4th highest ever observed in the month of October, behind October 8, 2011 (71F), October 6, 2007 (70F), and October 3, 2005 (72F).
image.png.424caab84c65e71380ada051c30902c6.png
The mean temperature of 80.5F on the 1st broke the monthly record by 2F:
image.png.4438afb0eb89991c9f98d3218154b3ca.png
9 of 24 hourly temperature records for the month of October (since 1945) were set yesterday:
image.thumb.png.2a7aa66f8637bdd9295bebc8ab6d14db.png
 
 
image.png.f7b6e45a90fe8276de15b1be6bbb969c.png

Great write up as usual.
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26 minutes ago, hardypalmguy said:


Great write up as usual.

Thank you.

Also, mean maximum temperature since August 1 is 2nd warmest on record, mean average and mean low temperature are both records for that period - the mean average temperature by a whopping 1.2F, and mean low temperature by 1.5F. Those are massive jumps for a 62-day period!

Mean maximum

image.png.a53881af0575ea290c4e0fa90e9a0c87.png

Mean Average

image.png.bf7aaa0c161c3fbf58da1d7655209fbb.png

Mean Low

image.png.48e3ff384e0ddbc436629ec229364de9.png

Interestingly, 17 years had mean average temperatures at or below the mean mimimum temperature from 2023 for this period:

image.png.3a1312f804272194286c0c36018e7968.png

And 14 years had mean maximum temperatures less than or equal to the mean average temperature of 2023:

image.png.0966b7d7c687dea965dc22d238e3c7a0.png

 

 

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11 minutes ago, TheClimateChanger said:

Thank you.

Also, mean maximum temperature since August 1 is 2nd warmest on record, mean average and mean low temperature are both records for that period - the mean average temperature by a whopping 1.2F, and mean low temperature by 1.5F. Those are massive jumps for a 62-day period!

Mean maximum

image.png.a53881af0575ea290c4e0fa90e9a0c87.png

Mean Average

image.png.bf7aaa0c161c3fbf58da1d7655209fbb.png

Mean Low

image.png.48e3ff384e0ddbc436629ec229364de9.png

Interestingly, 17 years had mean average temperatures at or below the mean mimimum temperature from 2023 for this period:

image.png.3a1312f804272194286c0c36018e7968.png

And 14 years had mean maximum temperatures less than or equal to the mean average temperature of 2023:

image.png.0966b7d7c687dea965dc22d238e3c7a0.png

 

 

Thank you for confirming how miserable this summer was for me. Couldn’t even get much relief at night.  

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32 minutes ago, OrdIowPitMsp said:

Thank you for confirming how miserable this summer was for me. Couldn’t even get much relief at night.  

That's amazing, considering this summer seemed pretty mild with no notable hot stretches (at least none that lasted more than a couple of days) to me in Madison, while Minneapolis, a place I think of as inevitably colder and snowier than us (like Green Bay, but soft, y'know, domed stadium and all), was so abnormally warm.

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2 hours ago, CheeselandSkies said:

That's amazing, considering this summer seemed pretty mild with no notable hot stretches (at least none that lasted more than a couple of days) to me in Madison, while Minneapolis, a place I think of as inevitably colder and snowier than us (like Green Bay, but soft, y'know, domed stadium and all), was so abnormally warm.

I mean it hasn't exactly been record-breaking like at MSP, but the period from August 1 to the present is 13th warmest (of 155 years) in the Madison Area threaded record. Only 5 years were warmer since records moved to MSN Airport - 1947, 1948, 1955, 1959 & 2016. Since 1959, only 2016 was warmer than this year has been since August 1.

image.png.18241faff1dd53c95f4ed42d61b3eaaf.png

And there has been some bouts of significant heat. Again, while not as impressive as the heat in Minneapolis, some of these monthly values have not been exceeded in decades.

In August, MSN reached as high as 96. Only 11 out of 155 years exceeded that value, and none since 1995. Prior to this year, it had not even reached 95F in August since 1995.

image.png.356bfd247a4c963e8d764ce2fc86bf60.png

In September, MSN reached as high as 94F. Only 7 out of 155 years exceeded that value in the month of September. The last time it was warmer in 1978, when it reached 97F. It did also reach 94F in September 2013.

image.png.481e367aeb6f32d74c4812d0669b01d1.png

And although October is only one day old, yesterday's high of 85F has been exceeded in only 9 years (out of 155 years of record) in the month of October. Point-click is forecasting 86F for MSN today.

image.png.2db3e5a95345536a7025d438f2279dfc.png

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2 hours ago, CheeselandSkies said:

That's amazing, considering this summer seemed pretty mild with no notable hot stretches (at least none that lasted more than a couple of days) to me in Madison, while Minneapolis, a place I think of as inevitably colder and snowier than us (like Green Bay, but soft, y'know, domed stadium and all), was so abnormally warm.

Not sure what caused it, but the west to east gradient was very obvious and very persistent all summer. This was the most pleasant summer here since 2014. Each month from May-Aug was cooler than avg and the hottest temp at Detroit, 90°, was the lowest annual max since 1915. I think maybe twice we had a heat index touch the mid 90s, and lots of comfortable fresh air days. 

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Some more October monthly records set or tied today, including 87F at Marquette, Michigan, and 83F at Sault Ste. Marie, Michigan.

Traverse City reached 88F, falling 1F short of the monthly record set on October 2, 1922. International Falls, Minnesota reached 87F, falling 1F short of the monthly record set on October 5, 1963, and October 11, 2015. Brainerd, Minnesota reached 88F, falling 1F short of the monthly record set yesterday. Green Bay reached 87F, falling 1F short of the monthly record set yesterday and on October 6, 1963. St. Cloud, Minnesota reached 90F, falling 1F short of the monthly record set yesterday.

Fun fact for Brainerd: they had the 2nd and 3rd highest temperatures ever recorded in the month of September last month (102, on the 3rd; and 97, on the 4th), and now have the first and second (tied) highest temperatures ever recorded in the month of October (89 yesterday, and 88 today). It also reached 88 on October 2, 1992, and October 2, 1953. Not bad for a POR dating to 1898.

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