Pittsburgh/Allegheny Cnty weather by month
Averages and records for each calendar month at Pittsburgh/Allegheny Cnty, United States, from 1935 to 2026. The warmest month is July, averaging 28.7°C; the coolest is January at 3.0°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 3.0°C | −4.9°C | 23.9°C25 January 1950 | −26.7°C23 January 1936 | 38 / 38 |
| February | 4.7°C | −4.3°C | 25.0°C24 February 2017 | −22.2°C19 February 1936 | 39 / 39 |
| March | 10.4°C | 0.0°C | 28.9°C22 March 2026 | −17.1°C6 March 2015 | 39 / 39 |
| April | 16.9°C | 5.5°C | 30.0°C27 April 1938 | −9.4°C14 April 1950 | 39 / 39 |
| May | 22.3°C | 11.0°C | 33.3°C26 May 1939 | −2.1°C9 May 2020 | 39 / 39 |
| June | 26.5°C | 15.7°C | 37.2°C29 June 2012 | 3.9°C8 June 1949 | 39 / 39 |
| July | 28.7°C | 18.1°C | 38.9°C14 July 1936 | 8.3°C2 July 2001 | 39 / 40 |
| August | 27.7°C | 17.4°C | 37.2°C27 August 1948 | 7.8°C31 August 1935 | 39 / 40 |
| September | 24.1°C | 13.5°C | 35.6°C13 September 1952 | 1.7°C18 September 1937 | 37 / 40 |
| October | 18.0°C | 7.7°C | 31.7°C3 October 1951 | −2.8°C27 October 1936 | 38 / 38 |
| November | 10.8°C | 1.8°C | 26.7°C5 November 1948 | −13.9°C25 November 1950 | 38 / 38 |
| December | 5.0°C | −2.6°C | 22.8°C5 December 2001 | −20.6°C26 December 1935 | 38 / 38 |
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 37 to 39 years each.
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Climate at nearby stations
The closest stations with twelve months of archive of their own, nearest first.
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.