Sussex County Climate
Sussex County, New Jersey
Avg Annual Temp
50.0°F
Annual Precip
47.0"
Annual Snowfall
38.7"
Extreme Heat Days
10.86
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Sussex County Weather
Cooler Alpine Influences
At an annual average of 50.0°F, Sussex County is significantly cooler than the national median. Its climate leans more toward a humid continental profile with crisp air and distinct seasonal shifts.
New Jersey's Coldest County
Sussex is the state's refrigerator, with its 50.0°F average falling well below the New Jersey average of 53.6°F. It consistently ranks as one of the coldest regions in the Garden State.
The Snow King of the Region
Sussex receives a massive 38.7 inches of snow annually, nearly tripling the snowfall found in Salem County. Winters are harsh here, with a December-February average of only 29.2°F.
Brief Summers and Long Winters
The county only sees 11 days of extreme heat per year, the lowest in the region. However, January is brutal with an average temperature of 26.7°F and heavy persistent snow cover.
Winterize for Heavy Snowfall
A high-performance snowblower and winter-rated tires are non-negotiable for the nearly 39 inches of annual snow. Residents enjoy lower cooling costs in the summer but must budget for significant heating expenses during the long winter.
Frequently Asked Questions
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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.