Wilmington Average Rainfall by Month

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

Average temperature by month

What's the Rainiest Month in Wilmington?

In Wilmington, June has the greatest precipitation of any month. On average, Wilmington gets 4.7 inches of precipitation in June.

However, May is the month with the greatest chance of precipitation. 37.7% of days in May will have at least some rain.

What's the Driest Month in Wilmington?

In Wilmington, February has the least precipitation of any month. On average, Wilmington gets 2.83 inches of precipitation in February.

October is the month with the lowest chance of precipitation. 28.6% of days in October will have measurable rain or snow.

Month	Precipitation	% Chance
January	3.23 in	34.7
February	2.83 in	35.0
March	4.16 in	36.0
April	3.51 in	37.0
May	3.52 in	37.7
June	4.67 in	36.7
July	4.40 in	32.3
August	3.98 in	28.8
September	4.37 in	29.3
October	3.67 in	28.6
November	3.05 in	29.3
December	3.85 in	34.3
Year	45.25 in	33.3

Weather Station Details

Years	Station	Coordinates
1948–2024	New Castle Airport	location
1932–1947	Wilmington Porter Research	location
1894–1931	Wilmington City Hall	location