Mt. Washington Average Rainfall by Month

This page shows the average precipitation (including snowfall) in each month of the year in Mt. Washington, New Hampshire. It is based on NOAA data for the years 1991–2020.
What's the Rainiest Month in Mt. Washington?
In Mt. Washington, October has the greatest precipitation of any month. On average, Mt. Washington gets 10.0 inches of precipitation in October.
However, January is the month with the greatest chance of precipitation. 64.6% of days in January will have at least some rain or snow.
What's the Driest Month in Mt. Washington?
In Mt. Washington, February has the least precipitation of any month. On average, Mt. Washington gets 5.44 inches of precipitation in February.
September is the month with the lowest chance of precipitation. 46.3% of days in September will have measurable rain or snow.
Month Precipitation % Chance
January 5.74 in 64.6
February 5.44 in 64.2
March 6.72 in 63.5
April 7.31 in 60.9
May 7.67 in 56.2
June 8.59 in 58.7
July 8.92 in 56.3
August 7.71 in 50.1
September 7.67 in 46.3
October 10.01 in 58.6
November 8.11 in 64.1
December 7.38 in 68.1
Year 91.27 in 59.3
Weather Station Details
Years Station Coordinates
1948–2024 Mt. Washington location