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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).
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).
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 ...
The city has a humid continental climate, typical of the Midwestern United States, with hot summers and cold, moderately snowy winters. Temperatures exceed 90 °F (32.2 °C) on an average of 24 days per year, and typically fall below 0 °F (−17.8 °C) on six nights annually. [13]
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The city of Cairo has a humid subtropical climate (Köppen Cfa) and has many characteristics of a city in the Upper South. Summers are hot and humid, with a daily average in July of 79 °F (26.1 °C) and temperatures reaching 90 °F (32 °C) on an average of 40 days annually.