Northumberland County Climate
Northumberland County, Pennsylvania
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
50.4°F
Annual Precip
45.8"
Annual Snowfall
31.1"
Extreme Heat Days
13
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
6b
Minimum winter temperature range for plant survival
2,874
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Northumberland County
Climate Verdict
Northumberland County has a mild, with an average annual temperature of 50.4°F, moderately wet with 45.8 inches of annual precipitation, rare extreme heat with only 12.75 days above 90°F annually, moderate snowfall of 31.1 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 27.1°F. summers are warm — July averages 72.5°F. The 45°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Northumberland County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Northumberland County closely matches the Pennsylvania statewide average temperature of 49.8°F.
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 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.