Sussex County Climate
Sussex County, New Jersey
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
50.0°F
Annual Precip
47.0"
Annual Snowfall
38.7"
Extreme Heat Days
11
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
6b
Minimum winter temperature range for plant survival
2,809
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Sussex County
Climate Verdict
Sussex County has a cool, averaging 50.0°F annually, moderately wet with 47.0 inches of annual precipitation, rare extreme heat with only 10.860000000000001 days above 90°F annually, moderate snowfall of 38.7 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 26.7°F. summers are warm — July averages 72.4°F. The 46°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Sussex County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Sussex County is 3.7°F cooler than the New Jersey statewide average of 53.6°F.
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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Track your own weather in Sussex County
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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.