Calvert County Climate
Calvert County, Maryland
Avg Annual Temp
58.9°F
Annual Precip
—
Annual Snowfall
—
Extreme Heat Days
30.7
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Precipitation data coming soon
Seasonal Overview
National Comparison
Data pending
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 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.