Philadelphia Intl climate by month
Averages and records for each calendar month at Philadelphia Intl, United States, from 1940 to 2026. The warmest month is July, averaging 30.6°C; the coolest is January at 4.5°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 4.5°C | −3.7°C | 23.3°C26 January 1950 | −21.7°C17 January 1982 | 86 / 86 |
| February | 6.0°C | −2.9°C | 25.0°C21 February 2018 | −20.0°C2 February 1961 | 86 / 86 |
| March | 11.2°C | 1.2°C | 30.6°C29 March 1945 | −13.9°C4 March 1943 | 86 / 86 |
| April | 17.7°C | 6.4°C | 35.0°C17 April 2002 | −7.2°C7 April 1982 | 86 / 86 |
| May | 23.2°C | 12.1°C | 36.7°C19 May 2026 | −2.2°C11 May 1966 | 86 / 86 |
| June | 28.1°C | 17.3°C | 38.3°C24 June 2025 | 6.7°C1 June 1945 | 85 / 86 |
| July | 30.6°C | 20.3°C | 40.0°C3 July 1966 | 10.6°C21 July 1966 | 86 / 86 |
| August | 29.4°C | 19.5°C | 38.3°C31 August 1953 | 6.7°C29 August 1986 | 86 / 86 |
| September | 25.7°C | 15.5°C | 37.8°C2 September 1953 | 1.7°C25 September 1963 | 85 / 86 |
| October | 19.5°C | 9.1°C | 35.6°C5 October 1941 | −3.9°C25 October 1962 | 85 / 85 |
| November | 13.1°C | 3.5°C | 28.9°C1 November 1950 | −9.4°C29 November 1955 | 85 / 85 |
| December | 6.9°C | −1.3°C | 22.8°C4 December 1998 | −17.2°C20 December 1942 | 86 / 86 |
Years shows the number behind the average high, then the number holding a record for that month. They differ because a year contributes an average only when the month has at least 25 days of readings, while a single reading is enough to set a record. The average low is withheld on the same 25-day rule and is counted separately again; it is shown as a dash where the archive cannot support it. Across the twelve months here the averages rest on 85 to 86 years each.
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Every figure on this page is computed from NOAA GHCN-Daily observations stored per station, per year, per month. Nothing is modelled, interpolated or estimated, and a month the archive never covered is left out rather than filled in. A station appears here only once all twelve months carry an average from at least 10 years. See how this is built.