Sussex County Climate
Sussex County, Delaware
Avg Annual Temp
57.2°F
Annual Precip
45.8"
Annual Snowfall
11.7"
Extreme Heat Days
27.233333333333334
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
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 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.