Trenton Average Temperature by Month

This page shows the average temperature in each month of the year in Trenton, New Jersey. It is based on NOAA data for the years 1991–2020.
What's the Hottest Month in Trenton?
In Trenton, New Jersey, the warmest month is July, with an average daily high temperature of 86.4 °F and an average low of 66.4 °F.
What's the Coldest Month in Trenton?
In Trenton, New Jersey, the coolest month is January, with an average daily high temperature of 40.0 °F and an average low of 24.1 °F.
Month Avg. High Avg. Low
January 40.0 °F 24.1 °F
February 43.0 °F 25.7 °F
March 51.1 °F 32.5 °F
April 63.2 °F 42.0 °F
May 72.6 °F 51.4 °F
June 81.5 °F 60.9 °F
July 86.4 °F 66.4 °F
August 84.3 °F 64.6 °F
September 77.4 °F 57.4 °F
October 65.7 °F 45.7 °F
November 54.8 °F 36.1 °F
December 44.7 °F 29.0 °F
Year 63.8 °F 44.7 °F
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