Norwich, United States weather by month
Measured at Willimantic/Windham Arpt
Averages and records for each calendar month at Willimantic/Windham Arpt, United States, from 1996 to 2026. The warmest month is July, averaging 28.5°C; the coolest is January at 2.7°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 2.7°C | −7.4°C | 21.1°C6 January 2007 | −25.0°C31 January 2026 | 30 / 30 |
| February | 4.3°C | −6.5°C | 22.2°C24 February 2017 | −26.6°C21 February 2015 | 29 / 30 |
| March | 9.1°C | −2.3°C | 30.0°C31 March 1998 | −21.7°C7 March 2003 | 30 / 30 |
| April | 15.6°C | 2.8°C | 34.4°C17 April 2002 | −7.7°C6 April 2016 | 30 / 30 |
| May | 21.4°C | 8.6°C | 36.1°C18 May 2017 | −2.2°C7 May 2001 | 30 / 30 |
| June | 25.8°C | 13.7°C | 36.7°C24 June 2025 | 3.3°C1 June 2001 | 30 / 30 |
| July | 28.5°C | 17.0°C | 37.8°C22 July 2011 | 8.3°C3 July 2001 | 29 / 31 |
| August | 27.7°C | 16.1°C | 38.3°C9 August 2001 | 7.2°C21 August 2000 | 31 / 31 |
| September | 23.9°C | 11.8°C | 35.6°C8 September 2015 | −1.0°C22 September 2020 | 29 / 31 |
| October | 17.6°C | 5.5°C | 29.4°C6 October 2007 | −6.7°C23 October 1997 | 29 / 30 |
| November | 11.3°C | −0.3°C | 26.7°C1 November 2024 | −15.0°C28 November 2002 | 30 / 30 |
| December | 5.6°C | −4.3°C | 24.4°C7 December 1998 | −21.1°C15 December 2005 | 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 29 to 31 years each.
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Climate at nearby stations
The closest stations with twelve months of archive of their own, nearest first.
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.