Plymouth Muni climate by month
Averages and records for each calendar month at Plymouth Muni, United States, from 1996 to 2026. The warmest month is July, averaging 27.9°C; the coolest is January at 3.3°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 3.3°C | −6.2°C | 20.6°C12 January 2020 | −23.9°C29 January 2005 | 30 / 30 |
| February | 4.7°C | −5.5°C | 21.1°C24 February 2017 | −24.3°C21 February 2015 | 28 / 30 |
| March | 8.3°C | −1.9°C | 26.7°C31 March 1998 | −19.9°C1 March 2015 | 30 / 30 |
| April | 13.8°C | 2.5°C | 33.3°C17 April 2002 | −10.5°C6 April 2016 | 30 / 30 |
| May | 19.4°C | 8.1°C | 33.9°C26 May 2010 | −3.3°C7 May 2001 | 30 / 30 |
| June | 24.5°C | 13.4°C | 37.8°C24 June 2025 | 1.1°C9 June 1997 | 30 / 30 |
| July | 27.9°C | 17.0°C | 38.3°C6 July 2010 | 7.2°C3 July 2001 | 31 / 31 |
| August | 27.0°C | 16.3°C | 37.2°C2 August 2006 | 7.8°C21 August 2000 | 31 / 31 |
| September | 23.1°C | 12.4°C | 35.6°C2 September 2010 | 0.0°C30 September 2000 | 30 / 31 |
| October | 17.2°C | 6.3°C | 30.0°C9 October 2011 | −7.8°C23 October 1997 | 30 / 30 |
| November | 11.5°C | 0.9°C | 26.1°C7 November 2022 | −12.8°C25 November 2000 | 30 / 30 |
| December | 6.4°C | −3.2°C | 24.4°C7 December 1998 | −16.1°C10 December 2000 | 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 28 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.