Belleville, IL Climate

Summary Graph

The summary climate graph for Belleville, IL shows a selection of temperature, rainfall and snow minimum, mean and maximum measures over the course of a year. Click on each of the measures in the key to toggle them on and off.

Graph of average and extreme temperature ranges by day for Belleville, IL.


The warmest month in Scott Air Force Base Midamerica, Belleville, Illinois is July with an average high temperature of 89.2°F. The hottest day on record was July 14 1954 when the temperature hit 109.9°F. During January the overnight temperature drops to an average of 23.8°F with the lowest temperature of -18.9°F being recorded on January 17 1977.

Warmest Days

Warmest Months

Coldest Days

Coldest Months

The warmest days on record are:

14 Jul 1954109.9°F
28 Jun 2012106°F
26 Jul 1952104.9°F
7 Jul 2012104.9°F
15 Aug 2007104.5°F

The warmest months on average were:

July 201297.9°F
July 195496°F
August 200795.8°F
July 198094.8°F
August 194794.5°F

The coldest days on record are:

17 Jan 1977-18.9°F
20 Jan 1985-13.9°F
28 Jan 1963-13°F
23 Dec 1989-12.8°F
3 Feb 1996-12.1°F

The coldest months on average were:

January 19778.9°F
January 194010.6°F
January 197912.9°F
January 196313.8°F
December 198914.5°F


The wettest month in Belleville, IL is April with an average of 2.2 inches of rain falling on 13 to 14 days. The driest month in Belleville, IL is February with an average of 1.2 inches of rain falling on 8 to 9 days.

Wettest Days

The wettest days on record are:

29 April 19966.2 inches
29 April 20122.6 inches
12 April 19792.2 inches
14 April 19912.2 inches
10 April 19941.8 inches

Wettest Months

The wettest months on record are:

April 199613.7 inches
October 200912.8 inches
May 199011.4 inches
May 200811.3 inches
April 199411.3 inches

Driest Months

The driest months on record are:

February 19380 inches
March 19380 inches
April 19380 inches
May 19380 inches
June 19380 inches