Union County Climate
Union County, New Jersey
Avg Annual Temp
55.0°F
Annual Precip
48.6"
Annual Snowfall
26.4"
Extreme Heat Days
28.46666666666667
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Union County Weather
Warm and Humid Eastern Climate
Union County’s 55.0°F annual average is comfortably above the national median temperature. This area experiences a humid climate with high moisture levels throughout the year.
Consistently Above State Averages
At 55.0°F, Union County is roughly 1.4 degrees warmer than the New Jersey state average of 53.6°F. Its urban density and coastal proximity contribute to these elevated temperature levels.
Hotter and Wetter than Warren
Union records 28 days of extreme heat annually, far outpacing Warren County's 17 days. It also receives 48.6 inches of precipitation, making it one of the more humid corridors in the region.
Steamy Summers and Steady Snow
July is hot with an average of 77.3°F and nearly a month's worth of days exceeding 90°F. Despite the heat, winters still deliver a significant 26.4 inches of snow on average.
Ready for Floods and Heat
Residents should plan for high humidity and 28 days of extreme heat with robust air conditioning. With 48.6 inches of rain and significant snowfall, maintaining clear gutters and sump pumps is vital for property care.
Frequently Asked Questions
What is the average temperature in Union County?
How much rain does Union County get?
Does it snow in Union County?
How hot does Union County get in summer?
How cold are winters in Union County?
Track your own weather in Union County
Ambient Weather personal weather stations give you hyperlocal climate data.
Sponsored
Data source: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020.
Climate normals are 30-year averages of weather variables computed from 1991 to 2020. Station data is aggregated to county level using spatial averaging. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.