Frederick County Climate
Frederick County, Maryland
Avg Annual Temp
54.5°F
Annual Precip
46.3"
Annual Snowfall
27.5"
Extreme Heat Days
20.233333333333334
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Frederick County Weather
Temperate Piedmont weather patterns
Frederick County's 54.5°F average is slightly warmer than the national median. This region experiences a balanced four-season climate typical of the Mid-Atlantic piedmont.
Slightly cooler than the state
The county's average temperature is 1.4 degrees lower than the Maryland state average of 55.9°F. It serves as a middle ground between the cold western mountains and the warm coastal plain.
Warmer than western Maryland
Frederick is significantly warmer and less snowy than neighboring Allegany. Its 46.3 inches of annual rain is slightly higher than the state average of 45.7 inches.
Moderate snow and summer heat
The county receives 27.5 inches of snow and sees 20 days of extreme heat over 90°F. Winters are chilly with a 32.3°F January average, while July peaks at a warm 75.8°F.
Plan for variable precipitation
Residents should prepare for both 27.5 inches of snow and 46.3 inches of rain throughout the year. Standard HVAC systems will handle the 20 days of extreme heat and typical winter lows.
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.