Nassau County Climate
Nassau County, Florida
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
70.0°F
Annual Precip
49.9"
Annual Snowfall
0.0"
Extreme Heat Days
45
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
9a
Minimum winter temperature range for plant survival
7,424
Excellent for heat-loving crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Nassau County
Climate Verdict
Nassau County has a warm, averaging 70.0°F year-round, moderately wet with 49.9 inches of annual precipitation, occasional hot days — 45.1 per year above 90°F, virtually no measurable snowfall. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are mild, with January temperatures averaging 54.9°F. summers are hot, with July averaging 82.8°F. The climate is remarkably stable year-round, with only a 28°F difference between January and July.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Nassau County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Nassau County closely matches the Florida statewide average temperature of 71.0°F, it is somewhat drier than average for Florida, the county experiences 46.91672075399347 fewer extreme heat days than the state average.
Climate Profile
About Nassau County Weather
Subtropical warmth above the national average
Nassau County's 70.0°F average temperature sits comfortably above the U.S. median. This humid subtropical climate offers a mild environment without the extreme cold found in northern states.
Cooler than the typical Florida average
Nassau is actually cooler than the Florida state average of 71.1°F, reflecting its northern location. Its 49.9 inches of annual rain also falls slightly short of the 54.8-inch state mean.
Milder heat than interior Florida
Nassau experiences 45 days of extreme heat, which is significantly lower than central counties like Orange. It remains warmer than western panhandle counties like Okaloosa, which averages 67.7°F.
Distinct winters and manageable summers
Winter temperatures average a cool 56.8°F, providing a true seasonal shift compared to South Florida. July peaks at 82.8°F, contributing to 45 days of temperatures reaching 90°F or higher.
Pack layers for the northern Florida winter
Residents need lightweight layers for winters that dip to a 54.9°F average in January. With less rainfall than the state average, standard lawn irrigation is usually sufficient for local landscaping.
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.