Olney Average Temperature by Month

This page shows the average temperature in each month of the year in Olney, Illinois. It is based on NOAA data for the years 1991–2020.
What's the Hottest Month in Olney?
In Olney, Illinois, the warmest month is July, with an average daily high temperature of 87.4 °F and an average low of 66.2 °F.
What's the Coldest Month in Olney?
In Olney, Illinois, the coolest month is January, with an average daily high temperature of 38.2 °F and an average low of 21.5 °F.
Month Avg. High Avg. Low
January 38.2 °F 21.5 °F
February 43.7 °F 25.2 °F
March 54.1 °F 33.4 °F
April 66.3 °F 43.6 °F
May 75.8 °F 54.1 °F
June 84.6 °F 62.9 °F
July 87.4 °F 66.2 °F
August 86.4 °F 64.1 °F
September 81.0 °F 56.5 °F
October 69.0 °F 45.1 °F
November 54.4 °F 34.3 °F
December 42.8 °F 26.4 °F
Year 65.3 °F 44.5 °F
Weather Station Details
Years Station Coordinates
1893–2024 Olney 2S location
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