Nassau County Climate
Nassau County, Florida
Avg Annual Temp
70.0°F
Annual Precip
49.9"
Annual Snowfall
0.0"
Extreme Heat Days
45.1
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
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 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.