Union County Climate
Union County, New Jersey
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
55.0°F
Annual Precip
48.6"
Annual Snowfall
26.4"
Extreme Heat Days
28
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
7a
Minimum winter temperature range for plant survival
3,747
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Union County
Climate Verdict
Union County has a mild, with an average annual temperature of 55.0°F, moderately wet with 48.6 inches of annual precipitation, occasional hot days — 28.46666666666667 per year above 90°F, moderate snowfall of 26.4 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 32.5°F. summers are warm — July averages 77.3°F. The 45°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
The moderate temperatures support hiking, cycling, and camping comfortably in spring, summer, and fall.
Regional Context
Union County closely matches the New Jersey statewide average temperature of 53.6°F.
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
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Data sources: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020. Forecast and alert data from National Weather Service API. Air quality data from Open-Meteo.
Climate normals are 30-year averages of weather variables. Station data is aggregated to county level. Forecasts and alerts are fetched live and may change frequently. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.