Mifflin County Climate
Mifflin County, Pennsylvania
Avg Annual Temp
51.9°F
Annual Precip
42.1"
Annual Snowfall
26.2"
Extreme Heat Days
18.1
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Mifflin County Weather
A Temperate Climate Above the National Median
Mifflin County maintains an average annual temperature of 51.9°F, placing it slightly above the national median for temperate regions. The local environment is classified as humid continental, characterized by distinct seasonal transitions.
Warmer Than the Pennsylvania Average
The county is warmer than the state average of 49.9°F, ranking as one of the more temperate areas in central Pennsylvania. Its 42.1 inches of annual precipitation is slightly lower than the statewide average of 45.3 inches.
Balanced Weather Compared to Central Neighbors
Mifflin enjoys a milder climate than the high-altitude counties to its north. While it receives 26.2 inches of snow, it remains drier than the state's more mountainous regions.
Hot Summers and Moderate Winters
Residents face 18 days of extreme heat reaching at least 90°F each year. Winters are manageable, with a January average of 29.0°F and total snowfall staying well below the 40-inch mark seen in the northeast.
Preparation for Seasonal Extremes
Homeowners should prioritize efficient HVAC systems to handle the nearly three weeks of extreme summer heat. Standard winterization is sufficient for the 26.2 inches of snow typical of the valley floor.
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.