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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.
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]
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.
Here’s how the Farmers’ Almanac summer forecast compares to monthly averages from the National Weather Service.
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. ... 10.8 10.2 10.8 ...
The normal high temperature in July is 90 °F (32 °C), and the normal low temperature in January is 19 °F (−7 °C), although this varies from year to year. Both 100 and 0 °F (37.8 and −17.8 °C) temperatures can be seen on an average 2 or 3 days per year.
In the entire month of January 1977, the temperature did not rise above 31 °F (−0.6 °C). The average temperature that month was around 10 °F (−12 °C). Chicago's yearly precipitation averages about 39 inches (990 millimeters).