Williamsport Average Rainfall by Month

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

Average temperature by month

What's the Rainiest Month in Williamsport?

In Williamsport, September has the greatest precipitation of any month. On average, Williamsport gets 4.8 inches of precipitation in September.

However, May is the month with the greatest chance of precipitation. 44.1% of days in May will have at least some rain.

What's the Driest Month in Williamsport?

In Williamsport, February has the least precipitation of any month. On average, Williamsport gets 2.31 inches of precipitation in February.

November is the month with the lowest chance of precipitation. 33.2% of days in November will have measurable rain or snow.

Month	Precipitation	% Chance
January	2.96 in	38.9
February	2.31 in	35.4
March	3.13 in	37.4
April	3.62 in	40.7
May	3.86 in	44.1
June	3.85 in	39.2
July	4.64 in	38.4
August	4.17 in	34.0
September	4.76 in	33.3
October	3.62 in	34.4
November	3.24 in	33.2
December	3.27 in	38.3
Year	43.42 in	37.3

Weather Station Details

Years	Station	Coordinates
1948–2024	Williamsport	location
1895–1947	Williamsport	location