Helena Average Rainfall by Month

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

Average temperature by month

What's the Rainiest Month in Helena?

In Helena, June has the greatest precipitation of any month. On average, Helena gets 2.2 inches of precipitation in June.

June is also the month where rain is most common. 38.4% of days in June will have at least some rain or snow.

What's the Driest Month in Helena?

In Helena, January has the least precipitation of any month. On average, Helena gets 0.38 inches of precipitation in January.

September is the month with the lowest chance of precipitation. 19.2% of days in September will have measurable rain or snow.

Month	Precipitation	% Chance
January	0.38 in	20.9
February	0.40 in	22.7
March	0.51 in	22.1
April	1.02 in	29.4
May	1.94 in	36.0
June	2.18 in	38.4
July	1.06 in	24.2
August	1.00 in	20.4
September	0.99 in	19.2
October	0.78 in	22.6
November	0.56 in	21.8
December	0.43 in	21.3
Year	11.24 in	24.9

Weather Station Details

Years	Station	Coordinates
1939–2024	Helena Regional Airport	location
1893–1938	Helna	location