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United States › Pennsylvania › Philadelphia County › Climate Station PHILA FRANKLIN INST, PA US Distance 4.1 mi Normals 1991–2020

30-year climate normals

Philadelphia County Climate and Weather Averages

Hottest month — July

89.3°

average daily high. The coldest month is January, averaging a low of 27.8°F.

Philadelphia County gets 50.69" of precipitation a year and 16.1" of snow, and 29% of it falls in Jul, Aug, Sep.

Temperature through the year

Each bar spans the average daily low to the average daily high for that month.

40° 60° 80° JanFebMarAprMayJunJulAugSepOctNovDec
MonthAvg highAvg low PrecipSnow
January 41.6° 27.8° 3.61" 6.4"
February 44.9° 29.6° 3.34" 4.0"
March 53.5° 36.4° 4.54" 2.0"
April 65.9° 46.3° 4.00" 0.1"
May 75.7° 56.3° 4.06" 0.0"
June 84.9° 65.9° 4.77" 0.0"
July 89.3° 71.4° 4.75" 0.0"
August 87.2° 69.5° 4.95" 0.0"
September 80.3° 62.7° 4.88" 0.0"
October 68.1° 51.1° 4.15" 0.0"
November 56.4° 41.3° 3.37" 0.1"
December 46.5° 33.2° 4.27" 3.5"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 29% falling in the wettest three months (Jul, Aug, Sep).

January 3.61"
February 3.34"
March 4.54"
April 4.00"
May 4.06"
June 4.77"
July 4.75"
August 4.95"
September 4.88"
October 4.15"
November 3.37"
December 4.27"
Annual total 50.69"

What this climate costs you

Degree days measure how hard a building has to work to stay comfortable. They are the reason two identical houses have very different power bills, and they are the link between the weather here and what you pay every month.

Cooling degree days How much air conditioning the climate demands 1,603
Heating degree days How much heating the climate demands 4,212
Approximate annual cooling cost At 21.55¢/kWh, Pennsylvania average $345
Approximate annual electric heating cost Lower where heating is gas rather than electric $318

These are rough planning figures from degree days and the state electricity price, not a bill estimate. House size, insulation and fuel type move them a lot. See the full cost of owning a home in Philadelphia County, where electricity is one line of eight.

Common questions

What is the weather like in Philadelphia County?

Philadelphia County averages a high of 89.3°F in July and a low of 27.8°F in January. Annual precipitation is 50.69 inches, including 16.1 inches of snow.

When is the rainy season in Philadelphia County?

The wettest stretch is Jul, Aug, Sep, which accounts for 29% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in Philadelphia County?

The average daily high in July, the hottest month, is 89.3°F. That drives 1,603 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Philadelphia County?

Yes. Philadelphia County averages 16.1 inches of snow a year.

Sources

  • Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station PHILA FRANKLIN INST, PA US (USC00366886), 4.1 miles from the county centroid.
  • Heating and cooling degree days — NOAA, same station and period.
  • Electricity price — US Energy Information Administration, Electric Power Monthly Table 5.6.A, Pennsylvania residential average.
  • Wet-season share is the wettest three consecutive months as a percentage of annual precipitation, calculated from the monthly normals.