Sussex County Climate
Sussex County, Delaware
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
57.2°F
Annual Precip
45.8"
Annual Snowfall
11.7"
Extreme Heat Days
27
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
7b
Minimum winter temperature range for plant survival
4,134
Excellent for heat-loving crops
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 mild, with an average annual temperature of 57.2°F, moderately wet with 45.8 inches of annual precipitation, occasional hot days — 27.233333333333334 per year above 90°F, light snow averaging 11.7 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 36.5°F. summers are warm — July averages 78.2°F. The 42°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
Sussex County closely matches the Delaware statewide average temperature of 56.4°F.
Climate Profile
About Sussex County Weather
Well above national temperature norms
Sussex County’s 57.2°F average annual temperature is significantly warmer than the national median. This southern Delaware enclave enjoys a mild, coastal-influenced climate for much of the year.
Delaware’s warmest region
This is Delaware’s warmest county, exceeding the state average of 56.4°F. Its position on the Delmarva Peninsula keeps it consistently warmer than New Castle County to the north.
Lighter snow than northern counties
Sussex averages 57.2°F, making it slightly warmer than Kent County and much warmer than New Castle. It also sees the least snow in the state, averaging only 11.7 inches compared to New Castle’s 16.1 inches.
Frequent heat and mild winters
Summer is intense with 27 days reaching 90°F or higher and a July average of 78.2°F. Winters are the mildest in the state, featuring a December-through-February average of 38.6°F and minimal snow.
Manage the summer heat
Homeowners should prioritize air conditioning maintenance to combat the state's highest frequency of extreme heat days. Conversely, the light 11.7-inch snowfall means winter weather gear is rarely a primary concern for residents.
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.