Great Falls Average Rainfall by Month

This page shows the average precipitation (including snowfall) in each month of the year in Great Falls, Montana. It is based on NOAA data for the years 1991–2020.

Average temperature by month

What's the Rainiest Month in Great Falls?

In Great Falls, June has the greatest precipitation of any month. On average, Great Falls gets 2.7 inches of precipitation in June.

June is also the month where rain is most common. 39.2% of days in June will have at least some rain or snow.

What's the Driest Month in Great Falls?

In Great Falls, January has the least precipitation of any month. On average, Great Falls gets 0.55 inches of precipitation in January.

November is the month with the lowest chance of precipitation. 21.6% of days in November will have measurable rain or snow.

Month	Precipitation	% Chance
January	0.55 in	22.4
February	0.59 in	29.0
March	0.68 in	26.2
April	1.72 in	33.2
May	2.43 in	36.5
June	2.71 in	39.2
July	1.23 in	22.8
August	1.21 in	21.9
September	1.33 in	23.6
October	1.08 in	23.9
November	0.68 in	21.6
December	0.52 in	21.0
Year	14.73 in	26.7

Weather Station Details

Years	Station	Coordinates
1937–2024	Great Falls International Airport	location
1892–1937	Great Falls 16th Street	location