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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.
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 ...
The record low for Morris is -26 °F (−32 °C) in December 1924. The average high temperature for Morris in July is 84.5 °F (43 °C), while the average January low is 15.4 °F (-9.2 °C). Morris has not been struck by any major tornadoes in recent history, although they occur in Northern Illinois annually.
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 ...
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 ...
Temperatures in July, and in summer in general, can frequently exceed 95 °F (35 °C), and occasionally exceed 100 °F (38 °C), although this does not happen each year. The coldest month of the year is January, where the average high temperature is 23 °F (−5 °C). Overnight low temperatures are usually around 8 °F (−13 °C).