Marthas Vineyard Arpt climate by month
Averages and records for each calendar month at Marthas Vineyard Arpt, United States, from 1998 to 2026. The warmest month is July, averaging 26.3°C; the coolest is January at 4.3°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 4.3°C | −4.6°C | 17.2°C12 January 2020 | −22.1°C4 January 2014 | 28 / 28 |
| February | 4.8°C | −4.7°C | 21.1°C16 February 2023 | −23.8°C15 February 2016 | 27 / 29 |
| March | 8.3°C | −1.4°C | 23.3°C21 March 2012 | −18.2°C1 March 2015 | 28 / 29 |
| April | 13.2°C | 2.6°C | 31.7°C17 April 2002 | −10.5°C2 April 2015 | 29 / 29 |
| May | 18.5°C | 8.0°C | 32.2°C25 May 2007 | −6.1°C7 May 2001 | 29 / 29 |
| June | 22.9°C | 12.7°C | 34.4°C22 June 2012 | −1.1°C2 June 2026 | 29 / 29 |
| July | 26.3°C | 16.5°C | 35.0°C6 July 2010 | 4.4°C9 July 2018 | 29 / 29 |
| August | 26.2°C | 15.7°C | 34.4°C2 August 2006 | 3.3°C26 August 2004 | 29 / 29 |
| September | 23.0°C | 11.9°C | 32.2°C1 September 2010 | −1.7°C30 September 2000 | 27 / 29 |
| October | 17.6°C | 6.9°C | 29.4°C9 October 2011 | −6.6°C23 October 2008 | 27 / 28 |
| November | 12.4°C | 2.4°C | 23.9°C7 November 2020 | −14.4°C25 November 2000 | 27 / 28 |
| December | 7.6°C | −1.5°C | 19.4°C4 December 1998 | −15.6°C26 December 1998 | 26 / 27 |
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 26 to 29 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.