Harrison County Climate
Harrison County, Mississippi
Avg Annual Temp
68.0°F
Annual Precip
67.2"
Annual Snowfall
0.1"
Extreme Heat Days
60.925
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Harrison County Weather
Tropical Leanings on the Coast
Harrison County is one of the warmest in the region with an annual average temperature of 68.0°F. This coastal climate is far removed from the national median, offering a nearly tropical environment.
Leading the State in Temperature
Harrison’s 68.0°F average is 4.1 degrees higher than the Mississippi state average of 63.9°F. It represents the peak of the state’s heat profile alongside other coastal neighbors.
The Wettest County in the Region
Harrison County receives a massive 67.2 inches of rain annually, surpassing neighbor Hancock County's 65.0 inches. It also maintains a higher average temperature than inland Forrest County.
Mississippi's Mildest Winter Climate
Winter temperatures average a balmy 53.6°F, with almost no recorded snowfall at 0.1 inches. July is hot at 82.1°F, but the sea breeze keeps extreme heat days to 61 per year.
Managing Extreme Rainfall and Humidity
With over 67 inches of annual rain, flood insurance and robust roofing are critical for residents. Cooling remains a year-round priority as temperatures rarely drop into a true cold zone.
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.