Delaware County Climate
Delaware County, Pennsylvania
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
56.7°F
Annual Precip
42.9"
Annual Snowfall
23.1"
Extreme Heat Days
28
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
7b
Minimum winter temperature range for plant survival
4,122
Excellent for heat-loving crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Delaware County
Climate Verdict
Delaware County has a mild, with an average annual temperature of 56.7°F, moderately wet with 42.9 inches of annual precipitation, occasional hot days — 28.25 per year above 90°F, moderate snowfall of 23.1 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 34.3°F. summers are warm — July averages 79.1°F. The 45°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
The moderate temperatures support hiking, cycling, and camping comfortably in spring, summer, and fall.
Regional Context
Delaware County is 6.9°F warmer than the Pennsylvania statewide average of 49.8°F, it is somewhat drier than average for Pennsylvania, the county experiences 16.98284065934066 more extreme heat days than the state average.
Climate Profile
About Delaware County Weather
The warmest pocket of PA
Delaware County averages a balmy 56.7°F, well above the national median and the state average. This coastal plain climate is significantly more temperate than the rest of the Commonwealth.
A statewide temperature leader
At 56.7°F, this is one of the warmest counties in Pennsylvania, exceeding the state average by nearly 7 degrees. Winters are much milder here, with average temperatures staying well above freezing.
Standing out in the region
Delaware County is nearly 4 degrees warmer than the Harrisburg area counties of Dauphin and Cumberland. It is also the least snowy county in this group, receiving just 23.1 inches annually.
Intense heat and soft winters
Summers are the hottest in the region, featuring 28 days over 90°F and a July average of 79.1°F. Winters are brief, with a Dec-Feb average of 36.6°F and minimal snowfall.
Prioritize summer heat safety
High-capacity air conditioning is essential to manage the month-long stretch of 90-degree days. Winter gear can be lighter here, as heavy snow is rare and temperatures often stay above freezing.
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.