Barnwell County Climate
Barnwell County, South Carolina
Avg Annual Temp
64.3°F
Annual Precip
47.5"
Annual Snowfall
—
Extreme Heat Days
81.35
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Barnwell County Weather
Warm temperatures in the coastal plain
Barnwell averages 64.3°F, well above the national median in a classic humid subtropical zone. The county receives 47.5 inches of annual precipitation, slightly below the state average.
Significantly warmer than the state norm
Barnwell is notably warmer than the state average of 62.8°F. It stands out as one of the hotter regions in the southern half of South Carolina.
Similar heat patterns to local neighbors
Its 64.3°F average mirrors Bamberg at 64.4°F and sits just above Aiken at 64.1°F. This consistency shows a uniform heat pattern across the western coastal plain region.
Intense summer heat and mild winters
Summer is intense with 81 days of extreme heat and a July average of 81.3°F. While snow data is unavailable, a 48.4°F winter average suggests frozen precipitation is very rare.
Prepare for a long summer season
With 81 days of temperatures over 90°F, energy-efficient cooling is the primary concern for local homes. Residents should plan for a long, hot summer and very brief, mild winters.
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.