Chester County Climate
Chester County, South Carolina
Avg Annual Temp
60.4°F
Annual Precip
43.5"
Annual Snowfall
0.5"
Extreme Heat Days
54.1
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Chester County Weather
Mild Temperatures and Dry Air
Chester County averages 60.4°F annually, positioning it as a mild but distinctly Southern climate. It is significantly warmer than the national median temperature. The region experiences a mix of humid subtropical and continental weather influences.
Drier and Cooler Than State Norms
The county's 43.5 inches of annual precipitation is noticeably lower than the state average of 48.9 inches. At 60.4°F, it also ranks cooler than the South Carolina average of 62.8°F. This combination creates a unique, less humid environment for the region.
A Drier Choice Than Clarendon
Chester County receives over 12 inches less rain per year than Clarendon County's 55.7 inches. Its 60.4°F average is also cooler than the 63.1°F found in neighboring Darlington. This makes the county one of the drier, more moderate areas in the central state.
Fifty-Four Days of Extreme Heat
Summer peaks in July with a 79.5°F average, including 54 days where temperatures exceed 90°F. Winters are cool and mostly dry, averaging 42.9°F with only 0.5 inches of snowfall. These seasons offer clear distinctions without the coastal humidity.
Focus on Irrigation and Efficient Cooling
The lower-than-average 43.5 inches of rainfall makes summer irrigation important for local landscaping. Residents should ensure HVAC systems can handle the 54 extreme heat days. Winter requires only light insulation given the rare snowfall and moderate lows.
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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.