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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.
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.
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 average household size was 2.42 and the average family size was 2.00. The city's age distribution consisted of 14.8% under the age of 18, 8.3% from 18 to 24, 34.5% from 25 to 44, 25.3% from 45 to 64, and 17.1% who were 65 years of age or older.
The average household size was 2.76 and the average family size was 2.27. The city's age distribution consisted of 22.9% under the age of 18, 8.8% from 18 to 24, 26.8% from 25 to 44, 24% from 45 to 64, and 17.6% who were 65 years of age or older.
The average temperatures in New Lenox range from 21 °F (-6 °C) in January to 73 °F (23 °C) in July. There are, on average, 137 days of the daily low temperature being below or at freezing, and 86 days when the daily high is above 80 °F (27 °C).
The average household size was 2.59 and the average family size was 3.03. In the city, the population was spread out, with 27.6% under the age of 18, 6.4% from 18 to 24, 29.4% from 25 to 44, 21.5% from 45 to 64, and 15.0% who were 65 years of age or older.
The average household size was 2.16 and the average family size was 2.82. In the city the population was spread out, with 20.0% under the age of 18, 7.4% from 18 to 24, 23.7% from 25 to 44, 20.7% from 45 to 64, and 28.2% who were 65 years of age or older.