ST LAWRENCE climate by month
Averages and records for each calendar month at ST LAWRENCE, Canada, from 1977 to 2025. The warmest month is August, averaging 20.0°C; the coolest is February at 0.3°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 1.8°C | −4.2°C | 13.0°C21 January 1981 | −17.8°C19 January 2020 | 20 / 27 |
| February | 0.3°C | −4.6°C | 15.0°C27 February 1980 | −18.9°C27 February 2023 | 17 / 27 |
| March | 4.0°C | −3.2°C | 19.0°C23 March 1979 | −17.4°C1 March 2023 | 22 / 27 |
| April | 6.9°C | −0.2°C | 22.0°C28 April 1979 | −13.5°C9 April 2015 | 19 / 27 |
| May | 11.1°C | 3.0°C | 23.0°C29 May 1981 | −4.7°C2 May 2017 | 19 / 28 |
| June | 15.5°C | 6.8°C | 28.0°C3 June 1978 | −1.3°C4 June 2007 | 24 / 28 |
| July | 18.9°C | 10.7°C | 29.4°C21 July 2005 | 1.0°C27 July 1992 | 23 / 30 |
| August | 20.0°C | 11.8°C | 29.4°C16 August 1993 | 1.0°C29 August 1992 | 26 / 30 |
| September | 17.2°C | 8.8°C | 26.9°C18 September 2024 | −1.7°C27 September 2015 | 21 / 29 |
| October | 12.5°C | 4.8°C | 23.0°C4 October 1980 | −3.8°C30 October 2009 | 23 / 27 |
| November | 8.0°C | 1.3°C | 16.6°C2 November 2014 | −10.7°C30 November 2013 | 20 / 29 |
| December | 3.8°C | −2.1°C | 16.0°C26 December 1980 | −17.9°C26 December 2013 | 22 / 28 |
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 17 to 26 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.