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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.
This is a list of cities by average temperature (monthly and yearly). The temperatures listed are averages of the daily highs and lows. Thus, the actual daytime temperature in a given month may be considerably higher than the temperature listed here, depending on how large the difference between daily highs and lows is.
Winter temperatures are generally cold. However, like much of the northern USA, can vary tremendously within the span of one week. The daily average high temperature in January at O'Hare is 31.0 °F (−0.6 °C) with the average daily low of 16.5 °F (−8.6 °C) and the daily mean of 23.6 °F (−4.7 °C).
Higher temperatures will yield more heat waves like the 1995 Chicago heat wave. [8] According to the National Weather Service, heat is a leading contributor to weather-related deaths. [9] Increases in temperature are especially dangerous in cities like Chicago, which experience the urban heat island effect. Future heat waves will yield similar ...
Weather is influenced primarily by cold Canadian Arctic air in the winter, and warm, humid air from the Gulf of Mexico in the summer. High temperatures in the south of the state are about 10 to 12 °F. warmer than the north. Average annual temperature is 47 °F. in the north and 58 °F. in the south. Temperatures greater than 90 °F. occur ...
July is the hottest month, and the daily average temperature is 84 °F (28.9 °C), while the daily low temperatures are around 65 °F (18.3 °C). [47] On average, summer temperatures reach at least 90 °F (32 °C) on as many as 16 days. [46] Winters are relatively cold and snowy, with blizzards sometimes occurring, as in 2011. There are many ...
Summers are usually hot and humid with the average high temperature in July (the hottest month) being 83.9 °F (28.8 °C). [53] [54] The winter months can bring bitterly cold Arctic air masses. The average high temperature in January (the coldest month) is 29.1 °F (−1.6 °C). [53] [54] June is Rockford's wettest month while January is the ...
The city lies within the typical hot-summer humid continental climate (Köppen: Dfa), and experiences four distinct seasons. [136] [137] [138] Summers are hot and humid, with frequent heat waves. The July daily average temperature is 75.4 °F (24.1 °C), with afternoon temperatures peaking at 84.5 °F (29.2 °C).