Williamsport Rgnl climate by month
Averages and records for each calendar month at Williamsport Rgnl, United States, from 1948 to 2026. The warmest month is July, averaging 29.2°C; the coolest is January at 1.6°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 1.6°C | −7.0°C | 20.6°C25 January 1967 | −28.9°C21 January 1994 | 78 / 78 |
| February | 3.5°C | −6.1°C | 24.4°C24 February 2017 | −25.0°C1 February 1971 | 78 / 78 |
| March | 9.0°C | −1.8°C | 30.6°C30 March 1986 | −18.9°C10 March 1996 | 78 / 78 |
| April | 16.3°C | 3.8°C | 34.4°C27 April 2009 | −9.4°C7 April 1982 | 78 / 78 |
| May | 22.2°C | 9.2°C | 35.6°C19 May 1996 | −2.2°C5 May 1966 | 79 / 79 |
| June | 26.8°C | 14.2°C | 38.9°C26 June 1952 | 2.2°C3 June 1986 | 79 / 79 |
| July | 29.2°C | 16.8°C | 39.4°C16 July 1988 | 6.1°C9 July 1963 | 79 / 79 |
| August | 28.0°C | 16.0°C | 37.8°C5 August 1955 | 3.3°C30 August 1965 | 79 / 79 |
| September | 23.8°C | 12.0°C | 38.9°C3 September 1953 | −1.1°C24 September 1963 | 78 / 79 |
| October | 17.4°C | 5.7°C | 32.8°C5 October 1951 | −6.7°C26 October 1952 | 78 / 78 |
| November | 10.2°C | 0.6°C | 28.3°C1 November 1950 | −13.3°C30 November 1976 | 78 / 78 |
| December | 3.9°C | −4.2°C | 21.1°C1 December 2006 | −26.1°C28 December 1950 | 78 / 78 |
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 78 to 79 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.