Mt Washington Rgnl climate by month
Averages and records for each calendar month at Mt Washington Rgnl, United States, from 1996 to 2026. The warmest month is July, averaging 26.2°C; the coolest is January at −2.9°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | −2.9°C | −15.1°C | 17.2°C6 January 2007 | −38.8°C16 January 2009 | 30 / 30 |
| February | −0.7°C | −14.9°C | 21.1°C21 February 2018 | −38.3°C14 February 2003 | 30 / 30 |
| March | 4.2°C | −8.8°C | 27.8°C31 March 1998 | −36.0°C7 March 2007 | 30 / 30 |
| April | 11.8°C | −2.0°C | 30.6°C28 April 2009 | −17.2°C7 April 2003 | 30 / 30 |
| May | 19.1°C | 3.8°C | 33.3°C27 May 2020 | −7.1°C18 May 2023 | 30 / 30 |
| June | 23.7°C | 8.8°C | 34.4°C10 June 2008 | −3.3°C1 June 2001 | 30 / 30 |
| July | 26.2°C | 11.5°C | 34.4°C2 July 2014 | −0.6°C28 July 2001 | 30 / 31 |
| August | 25.2°C | 10.3°C | 35.0°C9 August 2001 | −0.5°C20 August 2007 | 31 / 31 |
| September | 21.5°C | 6.1°C | 33.3°C4 September 1999 | −7.2°C29 September 2000 | 30 / 31 |
| October | 14.0°C | 0.9°C | 28.9°C4 October 2023 | −11.1°C31 October 2002 | 30 / 30 |
| November | 6.5°C | −4.2°C | 22.8°C11 November 2002 | −23.8°C23 November 2018 | 30 / 30 |
| December | 0.2°C | −10.4°C | 18.9°C7 December 1998 | −31.6°C30 December 2017 | 30 / 30 |
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 30 to 31 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.