Dillon Average Rainfall by Month

This page shows the average precipitation in each month of the year in Dillon, Montana. It is based on NOAA data for the years 1991–2020.
What's the Rainiest Month in Dillon?
In Dillon, June has the greatest precipitation of any month. On average, Dillon gets 1.9 inches of precipitation in June.
However, May is the month with the greatest chance of precipitation. 35.4% of days in May will have at least some rain.
What's the Driest Month in Dillon?
In Dillon, January has the least precipitation of any month. On average, Dillon gets 0.14 inches of precipitation in January.
January is also the month where rain is least common. 10.2% of days in January will have measurable rain.
Month Precipitation % Chance
January 0.14 in 10.2
February 0.23 in 16.4
March 0.46 in 21.0
April 1.11 in 30.1
May 1.73 in 35.4
June 1.87 in 35.3
July 0.81 in 20.6
August 0.81 in 20.9
September 0.96 in 19.9
October 0.71 in 19.1
November 0.35 in 17.6
December 0.27 in 15.1
Year 9.38 in 21.6
Weather Station Details
Years Station Coordinates
1941–2024 Dillon Airport location
1895–1940 University of Montana Western location
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