Jefferson County Climate
Jefferson County, Pennsylvania
Avg Annual Temp
47.7°F
Annual Precip
42.4"
Annual Snowfall
—
Extreme Heat Days
1.6
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Jefferson County Weather
The Region's Coldest County
Jefferson County is the coldest in this set with a 47.7°F annual average. This reflects a rugged continental climate with significantly more cold days than its neighbors.
Chillier Than the State Average
It sits 2.2 degrees below the Pennsylvania state average of 49.9°F. Annual precipitation is also slightly lower than the state mean, totaling 42.4 inches.
The Regional Icebox
Jefferson is the coldest county among its peers, averaging 4.3 degrees lower than Huntingdon. While other counties face many hot days, Jefferson only sees 2 days above 90°F.
Long Winters, Very Cool Summers
Winter is long with January averages dipping to 24.5°F. Summer is exceptionally cool, with a July average of 69.1°F and almost no extreme heat recorded.
Focus on Winter Heating
Prioritize home heating efficiency and cold-weather vehicle preparation for the sustained freeze. Extreme heat is rare, so homeowners should focus on insulation over high-powered cooling.
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.