Northumberland County Climate
Northumberland County, Pennsylvania
Avg Annual Temp
50.4°F
Annual Precip
45.8"
Annual Snowfall
31.1"
Extreme Heat Days
12.75
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Northumberland County Weather
Balanced Temperatures and Moderate Rain
Northumberland County averages 50.4°F annually, which closely tracks the national median. It experiences a classic humid continental climate with four distinct and equal seasons.
Matching the Pennsylvania Profile
The county’s average temperature is nearly identical to the state average of 49.9°F. Its 45.8 inches of annual precipitation also mirrors the statewide average of 45.3 inches almost perfectly.
A Middle Ground for Snowfall
At 31.1 inches of annual snow, Northumberland sits in the middle of the state's snowfall spectrum. It is less snowy than the Poconos to the east but more active than the southern valleys.
Consistent Summers and Crisp Winters
The county sees 13 days of extreme heat above 90°F during its 72.5°F July summers. January temperatures average 27.1°F, necessitating standard winter heating for several months.
Standard Seasonal Home Care
Residents should prepare for a balanced mix of weather, requiring both robust heating and moderate cooling systems. The 31.1 inches of snow is manageable with a standard shovel or small snowblower.
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.