Harrison County Climate
Harrison County, Mississippi
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
68.0°F
Annual Precip
67.2"
Annual Snowfall
0.1"
Extreme Heat Days
61
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
9a
Minimum winter temperature range for plant survival
6,817
Excellent for heat-loving crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Harrison County
Climate Verdict
Harrison County has a warm, averaging 68.0°F year-round, very wet conditions receiving 67.2 inches of precipitation annually, significant summer heat with 60.925 days annually above 90°F, light snow averaging 0.1 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are mild, with January temperatures averaging 51.7°F. summers are hot, with July averaging 82.1°F. The 30°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Harrison County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Harrison County is 4.2°F warmer than the Mississippi statewide average of 63.9°F, it is also noticeably wetter, receiving 7.7 inches more precipitation than the state average.
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 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.