Weather

We slipped back into summer this week. Average temperatures ranged from the mid-60s in northern Illinois to the mid-70s in southern Illinois, 4 to 8 degrees above normal. The lack of humidity and extremely dry conditions allowed daytime high temperatures to push well into the 90s this week. Some of the more impressive highs this week included 99 degrees in Alton and Decatur.
by Trent Ford, State Climatologist
ISWS PRI University of Illinois
This week was also very dry yet again across the state.…

Another beautiful weather week in Illinois as we transition from summer to fall. Average temperatures this week ranged from the low 60s to low 70s, between 1 and 7 degrees below normal.
by Trent Ford, State Climatologist
ISWS PRI University of Illinois
Although we didn’t see nighttime lows dip into the 30s yet, we did get 40 degrees in Stockton and 42 in Monmouth. The cool end to summer was welcome after an extremely hot and humid season.…

 
by Trent Ford, State Climatologist
ISWS PRI University of Illinois
Another beautiful weather week in Illinois as we transition from summer to fall. Average temperatures this week ranged from the low 60s to low 70s, between 1 and 7 degrees below normal. Although we didn’t see nighttime lows dip into the 30s yet, we did get 40 degrees in Stockton and 42 in Monmouth. The cool end to summer was welcome after an extremely hot and humid season.…

 
This weather week reminded me why I love living in central Illinois. Average temperatures this week range from the low 60s in northern Illinois to the mid-70s in southern Illinois, between 2 and 8 degrees below normal. Some of the more impressive nighttime low temperatures this week include 41 in Illinois City and 44 in Springfield. Carbondale reached 45 degrees overnight this week, the lowest August temperature there since 1988. The cool weather has brought August to date temperatures closer to the 30-year normal statewide and is quite a contrast to what has otherwise been an extremely humid summer.…

 
We had one more week of warm and humid conditions, with temperatures between 4 and 8 degrees above normal. August to date has been around 2 to 4 degrees warmer than average statewide, and this summer so far is among the top 10 warmest in most places. What is notable about this hot summer, though, is the lack of extreme daytime high temperatures; and in fact only a handful of locations in Illinois have seen high temperatures reach into the triple digits this year.…

 
It was back in the fire this week. Average temperatures ranged from the mid-70s to the low 80s, between 2 and 7 degrees above normal statewide. August to date has been around 1 degree above normal so far. The summer season so far has been the 5th warmest on record in Chicago, and the average nighttime low temperature in Peoria so far this summer is the highest since 1887. The extreme nighttime heat this summer is mostly thanks to persistently high humidity.…

 
by Trent Ford, State Climatologist
Illinois State Water Survey | Prairie Research Institute
University of Illinois
We can wrap a bow around a very hot and humid month of July across Illinois. Average temperatures in July were between 2 and 6 degrees above average, and last month will likely be a top 20 warmest July on record statewide. However, the character of the heat was different than past very hot Julys. We did not have several days with temperatures in the triple digits,…

by Trent Ford, State Climatologist
Illinois State Water Survey | Prairie Research Institute
University of Illinois
Another week of hot and humid weather across the state had me October dreaming. Average temperature this week ranged from the mid-70s in northern Illinois to the mid-80s in southern Illinois, between 2 and 6 degrees above normal. Virtually all parts of the state saw multiple days with high temperatures well into the 90s, including 98 degrees in Rock Island and 96 in Mt Vernon.…