Trenton Average Rainfall by Month

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

Average temperature by month

What's the Rainiest Month in Trenton?

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

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 Trenton?

In Trenton, February has the least precipitation of any month. On average, Trenton gets 2.77 inches of precipitation in February.

September is the month with the lowest chance of precipitation. 28.8% of days in September will have measurable rain.

Month	Precipitation	% Chance
January	3.42 in	33.9
February	2.77 in	34.4
March	4.13 in	36.7
April	3.64 in	36.3
May	3.73 in	37.7
June	4.58 in	37.1
July	4.73 in	34.8
August	4.17 in	32.0
September	4.13 in	28.8
October	3.81 in	30.4
November	3.28 in	28.9
December	4.10 in	35.2
Year	46.49 in	33.9

Weather Station Details

Years	Station	Coordinates
1999–2024	Trenton Mercer County Airport	location
1977–1998	Trenton State College	location
1913–1976	Trenton	location
1865–1913	Trenton 2	location