When is the first freeze in Philadelphia, PA?
NOAA's 1991-2020 climate normals for PHILADELPHIA INTL AP, PA US put the middle date for the first fall freeze (32°F or colder) at about Nov 10. The middle date for the first hard freeze (28°F or colder) is about Nov 23.
| First fall freeze (32°F), middle date | Nov 10 |
|---|---|
| First hard freeze (28°F), middle date | Nov 23 |
| Last spring freeze (32°F), middle date | Apr 2 |
| Chance of a 32°F night in a year | 100% |
| Weather station | PHILADELPHIA INTL AP, PA US (USW00013739) |
The middle date is NOAA's 50% date. In about half of years the first freeze comes sooner, and in half it comes later. One station can differ from nearby areas, mostly low or rural spots. Dates change each year, so check the latest National Weather Service forecast.
For HVAC and plumbing shops in Philadelphia
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NOAA National Centers for Environmental Information, U.S. Climate Normals 1991-2020, annual/seasonal normals, station USW00013739: fields ANN-TMIN-PRBFST-T32FP50, ANN-TMIN-PRBFST-T28FP50, ANN-TMIN-PRBLST-T32FP50, ANN-TMIN-PRBOCC-LSTH032. https://www.ncei.noaa.gov/data/normals-annualseasonal/1991-2020/access/USW00013739.csv. ForecastBooked is not affiliated with or endorsed by NOAA.