Bloomington-Normal Average Temperature by Month

This page shows the average temperature in each month of the year in Bloomington-Normal, Illinois. It is based on NOAA data for the years 1991–2020.
What's the Hottest Month in Bloomington-Normal?
In Bloomington-Normal, Illinois, the warmest month is July, with an average daily high temperature of 85.8 °F and an average low of 63.6 °F.
What's the Coldest Month in Bloomington-Normal?
In Bloomington-Normal, Illinois, the coolest month is January, with an average daily high temperature of 33.3 °F and an average low of 15.8 °F.
Month Avg. High Avg. Low
January 33.3 °F 15.8 °F
February 38.5 °F 19.4 °F
March 49.6 °F 28.2 °F
April 62.5 °F 38.7 °F
May 73.9 °F 50.8 °F
June 83.1 °F 60.3 °F
July 85.8 °F 63.6 °F
August 84.2 °F 61.4 °F
September 78.4 °F 53.3 °F
October 65.5 °F 42.3 °F
November 50.0 °F 30.8 °F
December 38.0 °F 21.6 °F
Year 62.0 °F 40.4 °F
Weather Station Details
Years Station Coordinates
1977–2024 Normal 4NE location
1893–1977 Bloomington Normal location