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.

All the numbers are long-term historical averages based on climate data gathered from 1981 to 2010.

Average Philadelphia temperatures
High °F Low °F   High °C Low °C
40 26 January 5 -4
44 28 February 7 -2
53 34 March 12 1
64 44 April 18 7
74 54 May 23 12
83 64 June 28 18
87 69 July 31 21
85 68 August 30 20
78 60 September 26 16
67 48 October 19 9
56 39 November 13 4
45 30 December 7 -1
65 47 Year 18 8

Days of Hot Weather in Philadelphia

The temperature at Philadelphia climbs into the 90s Fahrenheit for 24 days a year on average, scattered throughout late spring and summer. About once every two or three years, the thermometer here reaches 100 °F (38 °C). A day of 100-degree weather can show up in 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 0 0 0
April 8 2 0
May 20 9 1
June 28 20 5
July 31 28 10
August 31 26 6
September 26 13 1
October 11 2 0
November 2 0 0
December 0 0 0
Year 159 99 24

How Often Philadelphia Has Cold Temperatures

The coldest nights of winter at Philadelphia drop down to 10 °F (-12 °C) or below. About once in five years the city gets as cold as 0 °F (-18 °C).

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 8 23
February 0 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 6
December 0 4 18
Year 3 18 80
Reference

National Climatic Data Center. NOAA's 1981-2010 Climate Normals.

Pennsylvania Temperatures
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