September 2021 Climate Review: Temperatures finished the month around 1 to 2 degrees above normal. The first 10 days of the month were cooler than normal, in particular the low temperatures, which dropped into the 50s on many nights across the area. A warmer pattern greeted us from the 11th through 21st, with highs commonly in the mid 80s to around 90. Higher humidity levels during this time period also kept our lows elevated in the 60s, and even a couple of nights in the low 70s. In the wake of a strong cold front, the chilliest air mass since May descended into the region just in time for the Fall Equinox (September 22) and lasted through the 26th. Temperatures were primarily in the 70s for highs and 40s for lows. On the 22nd, clouds and showers kept temperatures even cooler across the Evansville area, which tied a record cool high of 61 degrees. The month ended on a warm note, with highs soaring into the mid to upper 80s from the 27th through 30th.
September precipitation totals were quite variable, but a decent chunk of the region ended up drier than normal. In particular, large sections of western Kentucky, far southern Illinois, and the Cape Girardeau MO area observed amounts from 0.5 inches to 2.5 inches drier than normal. Meanwhile, there were areas that finished wetter than normal, including from the Perryville, MO area east to Carbondale and Marion, IL and portions of the far southern Pennyrile region of west Kentucky, where amounts of 1 to 3.5 inches above normal occurred. The highest observed total in our area was 6.50 inches at the Herndon, KY COOP station in Christian County. Carbondale, IL was a close 2nd with 6.48 inches at the airport, which ranked as the 10th wettest September on record there.
| September 2021 Review: Precipitation and Temperature Maps (Click on image to enlarge) |
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| Climate Maps are from the Northeast Regional Climate Center |
Monthly Climate Report: Paducah | Evansville | Cape Girardeau | Poplar Bluff | Carbondale
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