Dorchester County Climate
Dorchester County, South Carolina
Avg Annual Temp
63.8°F
Annual Precip
51.7"
Annual Snowfall
0.3"
Extreme Heat Days
72.3
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Dorchester County Weather
Warmer than the national median
Dorchester County's average annual temperature of 63.8°F sits nearly ten degrees higher than the national median. This climate reflects a humid subtropical environment with long, warm seasons.
Exceeding the South Carolina average
The county is warmer than many of its peers, topping the South Carolina annual average of 62.8°F by a full degree. It also experiences more precipitation, with 51.7 inches of rain compared to the state average of 48.9 inches.
A wet and warm coastal neighbor
Dorchester maintains a wetter profile than several inland neighbors, recording nearly 3 inches more rain than the state average. Its 63.8°F average temperature keeps it consistently warmer than counties further toward the Piedmont.
Long summers and negligible snow
Summers are intense with 72 days reaching 90°F or higher and a July average of 80.5°F. Winter is mild at 48.4°F, bringing only 0.3 inches of annual snowfall.
Prepare for heat and humidity
Residents should service HVAC systems early to handle 72 days of extreme heat. With 51.7 inches of rain annually, ensuring proper property drainage is essential for the wet summer months.
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.