St. Johns County Climate
St. Johns County, Florida
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
70.5°F
Annual Precip
53.5"
Annual Snowfall
0.0"
Extreme Heat Days
69
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
9b
Minimum winter temperature range for plant survival
7,559
Excellent for heat-loving crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: St. Johns County
Climate Verdict
St. Johns County has a warm, averaging 70.5°F year-round, moderately wet with 53.5 inches of annual precipitation, significant summer heat with 68.85 days annually above 90°F, virtually no measurable snowfall. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are exceptionally mild, with January averaging 56.9°F. summers are hot, with July averaging 82.0°F. The climate is remarkably stable year-round, with only a 25°F difference between January and July.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for St. Johns County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
St. Johns County closely matches the Florida statewide average temperature of 71.0°F, the county experiences 23.166720753993474 fewer extreme heat days than the state average.
Climate Profile
About St. Johns County Weather
Temperate Coastal Subtropical
St. Johns County averages 70.5°F, staying much warmer than the national median while avoiding the extreme heat of the south. The Atlantic Ocean helps moderate the local climate.
Slightly Below State Average
The county's 70.5°F average is slightly cooler than the Florida state average of 71.1°F. This makes it one of the more temperate options for residents in the Sunshine State.
Cooler Than the South
St. Johns records only 69 extreme heat days, far fewer than Sarasota's 131. It is very similar to Putnam County in temperature but benefits from more consistent ocean breezes.
Gentle Winters and Warm Summers
Winter temperatures average 58.6°F, and summer averages sit at a manageable 81.2°F. Snow is never a factor, and extreme heat days are relatively limited to 69 per year.
Coastal Planning for Rain
With 53.5 inches of annual rain, drainage and moisture protection are key for property owners. Keep a light jacket handy for January, when the average temperature drops to 56.9°F.
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.