Quincy Average Rainfall by Month

This page shows the average precipitation in each month of the year in Quincy, Illinois. It is based on NOAA data for the years 1991–2020.
What's the Rainiest Month in Quincy?
In Quincy, May has the greatest precipitation of any month. On average, Quincy gets 4.5 inches of precipitation in May.
May is also the month where rain is most common. 41.3% of days in May will have at least some rain.
What's the Driest Month in Quincy?
In Quincy, January has the least precipitation of any month. On average, Quincy gets 1.56 inches of precipitation in January.
September is the month with the lowest chance of precipitation. 25.0% of days in September will have measurable rain.
Month Precipitation % Chance
January 1.56 in 25.1
February 1.72 in 26.1
March 2.28 in 32.5
April 3.98 in 38.6
May 4.55 in 41.3
June 4.50 in 34.4
July 3.50 in 29.3
August 3.88 in 27.1
September 3.01 in 25.0
October 3.01 in 28.6
November 2.41 in 26.7
December 1.82 in 23.4
Year 36.23 in 29.8
Weather Station Details
Years Station Coordinates
1949–2024 Quincy Regional Airport location
1901–1948 Quincy location
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