Barnwell County Climate
Barnwell County, South Carolina
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
64.3°F
Annual Precip
47.5"
Annual Snowfall
—
Extreme Heat Days
81
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
8b
Minimum winter temperature range for plant survival
5,773
Excellent for heat-loving crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Barnwell County
Climate Verdict
Barnwell County has a warm, averaging 64.3°F year-round, moderately wet with 47.5 inches of annual precipitation, significant summer heat with 81.35 days annually above 90°F. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are mild, with January temperatures averaging 46.5°F. summers are hot, with July averaging 81.3°F. The 35°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
Summer outdoor activities should be planned for early morning or evening to avoid extreme heat.
Regional Context
Barnwell County closely matches the South Carolina statewide average temperature of 62.8°F, the county experiences 18.289341085271303 more extreme heat days than the state average.
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 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.