Chicago, IL Climate

Summary Graph

The summary climate graph for Chicago, 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 Chicago, IL.


The warmest month in Chicago Ohare International, Chicago, Illinois is July with an average high temperature of 85.0°F. The hottest day on record was June 21 1988 when the temperature hit 104.0°F. During January the overnight temperature drops to an average of 15.8°F with the lowest temperature of -27.0°F being recorded on January 20 1985.

Warmest Days

Warmest Months

Coldest Days

Coldest Months

The warmest days on record are:

21 Jun 1988104°F
13 Jul 1995102.9°F
7 Jul 2012102.9°F
1 Jul 1956102.4°F
16 Jul 1988102°F

The warmest months on average were:

July 201294.3°F
July 198891.6°F
August 198391.6°F
July 201190.5°F
July 198390.4°F

The coldest days on record are:

20 Jan 1985-27°F
11 Jan 1982-26°F
25 Dec 1983-25.1°F
21 Jan 1984-22°F
30 Jan 1951-21.6°F

The coldest months on average were:

January 19821.5°F
January 19773.1°F
December 19633.6°F
January 19633.7°F
January 19795.2°F


The wettest month by average rainfall in Chicago, IL is August with an average of 3.3 inches of rain falling on 10 to 11 days.Although in April it typically rains on more days with 2.5 inches falling in 13 to 14 days. The driest month in Chicago, IL is February with an average of 1.3 inches of rain falling on 5 to 6 days.

Wettest Days

The wettest days on record are:

2 April 19832.5 inches
29 April 19812.1 inches
23 April 19992 inches
27 April 19951.9 inches
12 April 19791.7 inches

Wettest Months

The wettest months on record are:

August 198718.1 inches
September 200813.6 inches
May 200512 inches
July 201111.9 inches
August 200111.8 inches

Driest Months

The driest months on record are:

November 19460 inches
December 19460 inches
January 19470 inches
February 19470 inches
March 19470 inches