Calvert County Climate
Calvert County, Maryland
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
58.9°F
Annual Precip
—
Annual Snowfall
—
Extreme Heat Days
31
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
7b
Minimum winter temperature range for plant survival
4,559
Excellent for heat-loving crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Calvert County
Climate Verdict
Calvert County has a mild, with an average annual temperature of 58.9°F, occasional hot days — 30.7 per year above 90°F. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 37.7°F. summers are hot, with July averaging 80.3°F. The 43°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
The moderate temperatures support hiking, cycling, and camping comfortably in spring, summer, and fall.
Regional Context
Calvert County is 3.0°F warmer than the Maryland statewide average of 55.9°F.
Climate Profile
About Calvert County Weather
One of Maryland's warmest spots
Calvert County averages 58.9°F annually, placing it well above the national median temperature. This Southern Maryland peninsula enjoys a mild, humid subtropical climate.
Leading the state in warmth
The county is 3 degrees warmer than the Maryland state average of 55.9°F. It is consistently one of the warmest counties in Maryland due to its southern latitude and bay influence.
Warmer than northern bay counties
Calvert is warmer than Anne Arundel and significantly warmer than central Maryland counties like Carroll. Its July average of 80.3°F represents some of the highest summer temperatures in the region.
Hot summers and mild winters
Residents experience 31 days of extreme heat annually, with July averaging 80.3°F. Winters are among the state's mildest, featuring a January average of 37.7°F.
Prioritize summer cooling needs
The primary climate challenge is the 31 days of 90-degree weather, requiring efficient HVAC systems. While snowfall data is limited, the mild 39.7°F winter average suggests minimal snow disruption.
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.