ChescoWx

Unsurprisingly just like Chester County PA the raw data shows weak warming, at about two-thirds of NCEI’s rate looking at annual average temperatures for Yellow Medicine County from 1895 through 2025. As seems to be a common approach NCEI’s adjustments push the early years down and the recent years up. Before about 2000, NCEI’s values sit mostly below the raw ones; since then the two lines nearly overlap.....sounds familiar!

Sorry Don but the concentration of daily highs were by far occurring before 2000 across all locations! Most of Yellow Medicine’s daily record highs were set before 2000: about three-quarters before 2000 and about 90% before 2020. This counts all 366 calendar dates in the raw station data through 2025. Before 2000 Before 2020 Canby (in county, 1916–2025) 76% 91% Area, all 6 stations (1893–2025) 73% 89% Area without Granite Falls 75% 91% Canby’s records show about 75% of its years are before 2000, and 76% of its records were set then. About 94% of its years are before 2020, and 91% of its records were set then. That points to no clear trend toward more record highs. By decade, the 1930s dominate: they hold about 70 of the 366 area daily records, nearly twice any other decade. Canby alone has 72 from the 1930s, against 40 from the 1980s and 32 from the 2020s. Don Granite Falls exaggerates records as in fact that station only has temperatures for 1893–1897 and then not again until 2007. These are the days with a high temperature reported each year: Years Temperature Precipitation 1893–1896 Nearly complete (317–355 days a year) Yes 1897 61 days, then it stops Partial 1898–1947 None None 1948–1951 None Yes 1991–2006 None Yes, with gaps 2007–2025 Complete Yes

Still using altered not actual data with those figures....the facts are 6 of the top 10 warmest Septembers all occurred prior to 2000.With 3 of the top 6 warmest all before 1935!

Thanks Dream! excellent post and great points! I like you was on the opposite side of the fence but switched to the more benign view of CC. Just to be clear I of course believe in Climate Change that is scientific fact! I simply believe in the cyclical version plus I don't buy the one way ticket to boiling etc. that some of the more passionate alarmists lean into.

Lows this morning ranged from the upper 20's to lower 40's depending on elevation. Most valley spots saw temperatures below freezing this morning.

Lows this morning ranged from the upper 20's to lower 40's depending on elevation. Most valley spots saw temperatures below freezing this morning.

Happy Friday! In the past I used to have some folks even here on Americanwx suggest my East Nantmeal Davis VP2 runs too cool (some here used to say the East Nantmeal Icebox etc.) thinking I might have a siting or equipment issue, I ran the numbers. I would welcome any pushback on the method or the results. I used only stations that report on a midnight to midnight day, so morning and evening COOP observation times do not skew the comparison. That gives 20 Chester County Area stations: the DEOS network, KPTW, KMQS, KOQN and the Avondale 2N Climate Reference Network site. Against Avondale USCRN, the best reference we have, over 7,198 days with data from both stations (2007 to now), my highs run 1.4 degrees cooler and my lows run 1.4 degrees warmer. The average difference is +0.01 degrees. That is the classic upland elevation based signature at 678 FT: cooler afternoons, and milder nights as cold air drains off the hill. A poorly sited station usually shows the opposite, with cold nights in a frost hollow or cool afternoons only on sunny days from shade. Across the full network since 2012 my average is 0.68 degrees below the network mean. The USCRN site is 0.63 below, and Warwick DEOS, my nearest neighbor, is 0.56 below. Daily highs line up with elevation at about 5 degrees per 1,000 ft. Mine sit 0.7 degrees below that line, about where the other aspirated sensors (USCRN and the KPTW ASOS) also sit. A cheap passive-shield station on a pole right next to my Davis reads highs 3 degrees warmer, and 3.3 degrees warmer on sunny days. Most backyard stations people compare against use passive shields, so an aspirated sensor will usually look cool next to them in the afternoon. Let me know if any questions or if you see anything that does not hold up (see detail below) as I have always strived to show the most accurate possible data for the climate here in good old Chesco!

Happy Friday! In the past I used to have some folks even here on Americanwx suggest my East Nantmeal Davis VP2 runs too cool (some here used to say the East Nantmeal Icebox etc.) thinking I might have a siting or equipment issue, I ran the numbers. I would welcome any pushback on the method or the results. I used only stations that report on a midnight to midnight day, so morning and evening COOP observation times do not skew the comparison. That gives 20 Chester County Area stations: the DEOS network, KPTW, KMQS, KOQN and the Avondale 2N Climate Reference Network site. Against Avondale USCRN, the best reference we have, over 7,198 days with data from both stations (2007 to now), my highs run 1.4 degrees cooler and my lows run 1.4 degrees warmer. The average difference is +0.01 degrees. That is the classic upland elevation based signature at 678 FT: cooler afternoons, and milder nights as cold air drains off the hill. A poorly sited station usually shows the opposite, with cold nights in a frost hollow or cool afternoons only on sunny days from shade. Across the full network since 2012 my average is 0.68 degrees below the network mean. The USCRN site is 0.63 below, and Warwick DEOS, my nearest neighbor, is 0.56 below. Daily highs line up with elevation at about 5 degrees per 1,000 ft. Mine sit 0.7 degrees below that line, about where the other aspirated sensors (USCRN and the KPTW ASOS) also sit. A cheap passive-shield station on a pole right next to my Davis reads highs 3 degrees warmer, and 3.3 degrees warmer on sunny days. Most backyard stations people compare against use passive shields, so an aspirated sensor will usually look cool next to them in the afternoon. Let me know if any questions or if you see anything that does not hold up (see detail below) as I have always strived to show the most accurate possible data for the climate here in good old Chesco!

Thank you Canderson!!! You and me both let's keep these kind of posts out of this forum!! Most folks could care less about climate change or alarmism etc.! Thanks again!!

Again you are using altered post hoc data that is not the actual raw historical data....

Go check it out under the appropriate thread - thanks again PSU!

The data is now in the appropriate thread - now let the good folks here go back to their autumn obs!! thanks!

Nope! The raw September trend for 1895–2025 is +0.13°F per decade, and it is not statistically significant (p ≈ 0.10; 95% range −0.03 to +0.29°F per decade). Series °F/decade 95% range p Raw September, 1895–2025 +0.13 ±0.16 0.10, not significant

the altered data adds 60% more warming than the actual data.....

The above data is like most other places sufferring from NCEI altered temperatures which as is usually the case warms the past and chills the current. Below is actual vs altered data for beautiful Yellow Medicine County!! The graph shows 1895–2025: the NCEI adjusted line is in red and the raw station data in blue, each with its trend line. The trend is +0.19°F/decade for NCEI and +0.12°F/decade for raw, so NCEI shows about 60% more warming than the raw data - call me stunned!!