Watertown Intl climate by month
Averages and records for each calendar month at Watertown Intl, United States, from 1949 to 2026. The warmest month is July, averaging 26.5°C; the coolest is January at −1.7°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | −1.7°C | −12.4°C | 18.9°C14 January 1995 | −41.7°C16 January 1994 | 77 / 77 |
| February | −0.6°C | −11.8°C | 20.6°C27 February 2024 | −38.2°C14 February 2016 | 77 / 77 |
| March | 4.7°C | −5.8°C | 28.9°C30 March 1977 | −31.1°C12 March 1984 | 77 / 77 |
| April | 12.3°C | 0.8°C | 31.7°C28 April 1990 | −14.4°C1 April 1965 | 77 / 77 |
| May | 18.8°C | 6.6°C | 32.8°C30 May 2018 | −7.8°C7 May 1966 | 77 / 77 |
| June | 23.7°C | 11.8°C | 35.0°C14 June 1949 | −1.7°C5 June 1964 | 77 / 77 |
| July | 26.5°C | 14.7°C | 36.1°C18 July 1953 | 0.6°C2 July 1962 | 77 / 77 |
| August | 25.7°C | 13.8°C | 35.6°C19 August 1955 | −1.1°C27 August 1969 | 78 / 78 |
| September | 21.5°C | 9.5°C | 35.6°C4 September 1953 | −5.6°C30 September 1991 | 77 / 78 |
| October | 15.0°C | 4.1°C | 28.9°C5 October 1951 | −11.1°C20 October 1972 | 77 / 77 |
| November | 8.0°C | −1.0°C | 25.0°C2 November 1971 | −21.6°C22 November 2018 | 77 / 77 |
| December | 1.4°C | −7.9°C | 20.6°C4 December 2012 | −38.3°C25 December 1980 | 77 / 77 |
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 77 to 78 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.