Philadelphia Temperatures: Averages by Month





The numbers here tell you how hot and cold the weather usually is in Philadelphia, Pennsylvania during each month of the year.

The average high and low temperatures are listed below monthly and annually for Philadelphia, in both degrees Fahrenheit and Celsius.

Maximums and minimums are only part of the temperature picture. To fill in the rest, there's information on how many days a month get above or below a given temperature.

To find out how often it rises over 70, 80 or 90 °F each month in Philadelphia, scroll down farther. There are also monthly and yearly counts of days with cold weather.

The first set of high and low temperatures are averages for 2010 to 2019. Everything else here is based on 1991 to 2020 weather.

10-year temperature averages for Philadelphia, 2010 to 2019
High °F Low °F   High °C Low °C
41 26 January 5 -3
44 29 February 7 -2
53 35 March 12 2
66 46 April 19 8
76 57 May 24 14
84 65 June 29 19
89 72 July 32 22
86 69 August 30 21
80 63 September 27 17
68 52 October 20 11
55 39 November 13 4
47 34 December 8 1
66 49 Year 19 9
30-year temperature averages for Philadelphia, 1991 to 2020
High °F Low °F   High °C Low °C
41 26 January 5 -3
44 28 February 7 -3
53 34 March 12 1
65 44 April 18 7
74 54 May 24 12
83 64 June 28 18
88 70 July 31 21
86 68 August 30 20
79 61 September 26 16
67 49 October 20 10
56 39 November 13 4
46 31 December 8 0
65 47 Year 18 9

Days of Hot Weather in Philadelphia

The temperature at Philadelphia climbs into the 90s Fahrenheit for 30 days a year on average, scattered throughout spring and summer. Normally once a year the thermometer here reaches 100 °F (38 °C). A day of 100-degree weather can show up in June, July or August.

Days per month in Philadelphia of at least 70, 80 or 90 °F
  70 °F
21 °C
80 °F
27 °C
90 °F
32 °C
January 0 0 0
February 0 0 0
March 2 0 0
April 9 2 0
May 21 10 2
June 29 22 6
July 31 28 13
August 31 27 8
September 27 14 2
October 13 3 0
November 3 0 0
December 0 0 0
Year 166 107 30

How Often Philadelphia Has Cold Temperatures

The coldest nights of winter at Philadelphia drop down to 10 °F (-12 °C) or below, which happens twice a year on average.

From December to March, Philadelphia can remain below freezing all day long. The city typically has 13 days a year when the temperature never rises above 32 °F.

Days per month on average in Philadelphia when the minimum temperature drops to 10, 20, or 32 °F or below
  10 °F
-12 °C
20 °F
-8 °C
32 °F
0 °C
January 2 7 23
February 1 5 20
March 0 1 12
April 0 0 1
May 0 0 0
June 0 0 0
July 0 0 0
August 0 0 0
September 0 0 0
October 0 0 0
November 0 0 5
December 0 2 17
Year 2 16 77
References

Jay Lawrimore, Ron Ray, Scott Applequist, Bryant Korzeniewski, Matthew Menne. 2016. Global Summary of the Month and Year, Version 1.0. NOAA National Centers for Environmental Information.

NOAA National Centers for Environmental Information (NCEI). Climate Normals.

Pennsylvania Temperatures
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