Boston Average Rainfall by Month

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

Average temperature by month

What's the Rainiest Month in Boston?

In Boston, March has the greatest precipitation of any month. On average, Boston gets 4.2 inches of precipitation in March.

However, April is the month with the greatest chance of precipitation. 38.6% of days in April will have at least some rain or snow.

What's the Driest Month in Boston?

In Boston, August has the least precipitation of any month. On average, Boston gets 3.14 inches of precipitation in August.

August is also the month where rain is least common. 29.1% of days in August will have measurable rain.

Month	Precipitation	% Chance
January	3.39 in	38.1
February	3.21 in	37.2
March	4.17 in	37.5
April	3.62 in	38.6
May	3.25 in	38.1
June	3.89 in	36.4
July	3.27 in	30.4
August	3.14 in	29.1
September	3.55 in	29.9
October	4.02 in	33.8
November	3.66 in	34.4
December	4.29 in	38.3
Year	43.45 in	35.1

Weather Station Details

Years	Station	Coordinates
1936–2024	Boston Logan International Airport	location
1893–1935	Boston City	location