Trenton climate by month
Averages and records for each calendar month at Trenton, Canada, from 1935 to 2026. The warmest month is July, averaging 26.3°C; the coolest is January at −2.3°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | −2.3°C | −11.8°C | 15.1°C8 January 2008 | −35.1°C16 January 1994 | 89 / 90 |
| February | −1.2°C | −10.8°C | 16.3°C27 February 2024 | −32.2°C15 February 1943 | 87 / 88 |
| March | 4.0°C | −5.4°C | 25.4°C31 March 1998 | −28.9°C4 March 1938 | 88 / 88 |
| April | 11.6°C | 1.2°C | 29.6°C28 April 1990 | −14.4°C7 April 1972 | 89 / 89 |
| May | 18.3°C | 7.1°C | 33.4°C26 May 2010 | −6.1°C7 May 1966 | 87 / 88 |
| June | 23.5°C | 12.5°C | 35.6°C30 June 1964 | 1.1°C1 June 1945 | 88 / 90 |
| July | 26.3°C | 15.4°C | 38.9°C9 July 1936 | 5.6°C2 July 1936 | 86 / 86 |
| August | 25.4°C | 14.4°C | 36.1°C26 August 1948 | 3.3°C31 August 1935 | 84 / 86 |
| September | 21.0°C | 10.0°C | 35.0°C2 September 1953 | −4.6°C26 September 1978 | 84 / 87 |
| October | 14.2°C | 4.1°C | 29.5°C4 October 2023 | −8.3°C27 October 1936 | 86 / 86 |
| November | 7.2°C | −1.1°C | 22.8°C3 November 1961 | −19.4°C27 November 1949 | 85 / 86 |
| December | 0.5°C | −7.8°C | 16.6°C24 December 2015 | −31.8°C27 December 1993 | 83 / 87 |
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 83 to 89 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.