Delaware County Climate
Delaware County, Pennsylvania
Avg Annual Temp
56.7°F
Annual Precip
42.9"
Annual Snowfall
23.1"
Extreme Heat Days
28.25
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
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 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.