St Johnsbury climate by month
Averages and records for each calendar month at St Johnsbury, United States, from 1998 to 2025. The warmest month is July, averaging 26.7°C; the coolest is January at −2.7°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | −2.7°C | −12.7°C | 16.1°C6 January 2007 | −33.8°C16 January 2009 | 27 / 27 |
| February | −0.7°C | −12.2°C | 18.3°C21 February 2018 | −32.8°C14 February 2003 | 26 / 27 |
| March | 4.6°C | −6.6°C | 27.2°C21 March 2012 | −29.9°C7 March 2007 | 27 / 27 |
| April | 12.2°C | 0.0°C | 31.1°C17 April 2002 | −12.8°C1 April 2003 | 27 / 27 |
| May | 19.9°C | 6.5°C | 33.3°C27 May 2020 | −4.3°C18 May 2023 | 27 / 27 |
| June | 24.1°C | 11.6°C | 36.1°C23 June 2025 | 1.1°C1 June 2001 | 27 / 27 |
| July | 26.7°C | 14.6°C | 34.4°C3 July 2002 | 5.0°C28 July 2001 | 26 / 28 |
| August | 25.6°C | 13.4°C | 35.0°C9 August 2001 | 4.4°C24 August 2003 | 27 / 27 |
| September | 21.6°C | 9.4°C | 33.3°C9 September 2002 | −3.3°C29 September 2000 | 26 / 27 |
| October | 14.1°C | 3.3°C | 30.0°C4 October 2023 | −8.2°C31 October 2020 | 27 / 27 |
| November | 6.8°C | −2.2°C | 23.3°C6 November 2022 | −20.5°C23 November 2018 | 27 / 27 |
| December | 0.1°C | −8.4°C | 18.9°C7 December 1998 | −28.9°C21 December 2004 | 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 27 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.