Mount Washington climate by month
Averages and records for each calendar month at Mount Washington, United States, from 1948 to 2026. The warmest month is July, averaging 12.6°C; the coolest is January at −10.0°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | −10.0°C | −19.3°C | 8.9°C13 January 2013 | −43.3°C8 January 1968 | 78 / 79 |
| February | −9.9°C | −19.0°C | 8.9°C21 February 2018 | −43.9°C4 February 2023 | 79 / 79 |
| March | −6.5°C | −14.8°C | 12.8°C31 March 1998 | −38.9°C3 March 1950 | 79 / 79 |
| April | −1.1°C | −8.5°C | 15.6°C19 April 1976 | −28.9°C4 April 1954 | 79 / 79 |
| May | 5.3°C | −1.5°C | 18.9°C22 May 1977 | −18.9°C7 May 1966 | 79 / 79 |
| June | 10.4°C | 3.8°C | 22.2°C26 June 2003 | −10.6°C9 June 1980 | 79 / 79 |
| July | 12.6°C | 6.6°C | 21.7°C23 July 1952 | −4.4°C2 July 2001 | 79 / 79 |
| August | 11.8°C | 5.9°C | 22.2°C2 August 1975 | −6.7°C30 August 1965 | 79 / 79 |
| September | 8.5°C | 2.2°C | 20.6°C3 September 1999 | −12.8°C30 September 1992 | 78 / 79 |
| October | 2.9°C | −3.7°C | 16.7°C5 October 2005 | −18.9°C30 October 1966 | 78 / 78 |
| November | −2.5°C | −10.0°C | 11.1°C4 November 1982 | −32.2°C22 November 2018 | 78 / 78 |
| December | −7.5°C | −16.2°C | 8.3°C6 December 2001 | −40.6°C30 December 1962 | 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.
See what Mount Washington is doing right now
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.