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Illinois averages around 50 days of thunderstorm activity a year which put it somewhat above average for number of thunderstorm days for the United States. Illinois is vulnerable to tornadoes with an average of 54 occurring annually, which puts much of the state at around 9.7 tornadoes per 10,000 square miles (30,000 km 2) annually.
As for what a typical summer weather day is in Illinois, the University of Illinois state climatologist office says highs are usually in the 80s with lows in the 60s. Days above 90 degrees are ...
Minimum temperature map of the United States from 1871–1888 Maximum temperature map of the United States from 1871–1888. The following table lists the highest and lowest temperatures recorded in the 50 U.S. states, the District of Columbia, and the 5 inhabited U.S. territories during the past two centuries, in both Fahrenheit and Celsius. [1]
The 2012–13 autumn/winter season would fail to produce a daily maximum temperature below freezing 32 °F (0 °C) until January 1, 2013, the first such time that has happened in Chicago weather records. The entire calendar year of 2012 did not record a temperature lower than 5 °F (−15 °C).
Related: Here's what the Old Farmer's Almanac predicts for fall weather in Illinois this year. In this Feb. 2, 2011 file photo, a snow plow clears a residential area in north Peoria.
July 1, 1956: “It was the 13th day this year that the temperature has exceeded 90. The number of days with 90 or higher temperatures is ahead of last year when the all-time record of 46 such ...
According to a 2021 report from The Nature Conservancy, the average daytime temperature in Illinois has increased by 1 to 2 °F (0.6 to 1.2 °C) over the historical average in the last 100 years. Additionally, the nighttime minimum temperatures are rising at a faster rate than the daytime high temperatures.
In recent years, average temperatures in the county seat of Hennepin have ranged from a low of 13 °F (−11 °C) in January to a high of 86 °F (30 °C) in July, although a record low of −30 °F (−34 °C) was recorded in January 1999 and a record high of 104 °F (40 °C) was recorded in June 1988.