Frederick County Climate
Frederick County, Maryland
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
54.5°F
Annual Precip
46.3"
Annual Snowfall
27.5"
Extreme Heat Days
20
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
7a
Minimum winter temperature range for plant survival
3,644
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Frederick County
Climate Verdict
Frederick County has a mild, with an average annual temperature of 54.5°F, moderately wet with 46.3 inches of annual precipitation, occasional hot days — 20.233333333333334 per year above 90°F, moderate snowfall of 27.5 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 32.3°F. summers are warm — July averages 75.8°F. The 43°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Frederick County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Frederick County closely matches the Maryland statewide average temperature of 55.9°F.
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
What is the average temperature in Frederick County?
How much rain does Frederick County get?
Does it snow in Frederick County?
How hot does Frederick County get in summer?
How cold are winters in Frederick County?
Track your own weather in Frederick County
Ambient Weather personal weather stations give you hyperlocal climate data.
Sponsored
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.