Galesburg Average Temperature by Month

This page shows the average temperature in each month of the year in Galesburg, Illinois. It is based on NOAA data for the years 1991–2020.
What's the Hottest Month in Galesburg?
In Galesburg, Illinois, the warmest month is July, with an average daily high temperature of 84.3 °F and an average low of 65.6 °F.
What's the Coldest Month in Galesburg?
In Galesburg, Illinois, the coolest month is January, with an average daily high temperature of 30.4 °F and an average low of 14.8 °F.
Month Avg. High Avg. Low
January 30.4 °F 14.8 °F
February 35.2 °F 18.6 °F
March 48.5 °F 29.2 °F
April 61.8 °F 40.2 °F
May 72.5 °F 52.0 °F
June 81.4 °F 62.0 °F
July 84.3 °F 65.6 °F
August 82.5 °F 63.6 °F
September 76.4 °F 55.3 °F
October 63.2 °F 43.0 °F
November 48.3 °F 30.9 °F
December 35.6 °F 21.1 °F
Year 60.2 °F 41.6 °F
Weather Station Details
Years Station Coordinates
1895–2024 Galesburg location
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