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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.
Here’s how the Farmers’ Almanac summer forecast compares to monthly averages from the National Weather Service.
Around the region, many sites recorded at least 10 days at or above 100°, including 15 consecutive days at or above 100 in south rural LaSalle, which recorded an average high temperature of 100.8 °F (38.2 °C) for the month of July, 1936. Temperatures peaked as high as 112 °F (44 °C) in Rockford. [42]
The maps are derived from U.S. climate normals provided by the National Centers for Environment Information (NCEI): The dataset consists of the latest 30-year average of weather data, including ...
The Cashe River area in southern Illinois forms the basis for a ... Average annual temperature is 47 °F. in the north and 58 °F. in the south. ... 0.2 1.6 6.3 28.2 ...
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.
Of the 7,720 households, 32.6% had children under the age of 18 living with them, 57.0% were married couples living together, 8.5% had a female householder with no husband present, 30.3% were non-families, and 26.1% of all households were made up of individuals. The average household size was 2.57 and the average family size was 3.11.
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.