SARNIA CLIMATE, ONT climate by month
Averages and records for each calendar month at SARNIA CLIMATE, ONT, Canada, from 2006 to 2026. The warmest month is July, averaging 26.9°C; the coolest is January at −0.6°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | −0.6°C | −7.6°C | 15.7°C9 January 2026 | −25.0°C7 January 2014 | 20 / 20 |
| February | 0.4°C | −7.9°C | 20.7°C27 February 2024 | −28.3°C16 February 2015 | 20 / 20 |
| March | 6.3°C | −3.0°C | 28.2°C21 March 2012 | −21.2°C3 March 2014 | 20 / 21 |
| April | 12.9°C | 1.9°C | 28.7°C15 April 2010 | −7.1°C16 April 2014 | 21 / 21 |
| May | 19.2°C | 7.7°C | 32.3°C29 May 2006 | −3.4°C13 May 2020 | 20 / 20 |
| June | 24.3°C | 13.3°C | 35.2°C8 June 2011 | 2.9°C5 June 2009 | 20 / 20 |
| July | 26.9°C | 16.5°C | 36.7°C17 July 2012 | 8.2°C1 July 2010 | 20 / 20 |
| August | 25.8°C | 15.7°C | 35.4°C2 August 2007 | 6.3°C26 August 2017 | 20 / 20 |
| September | 22.5°C | 11.8°C | 35.9°C10 September 2013 | 1.1°C19 September 2020 | 19 / 20 |
| October | 16.0°C | 6.6°C | 32.5°C8 October 2007 | −4.2°C31 October 2020 | 19 / 19 |
| November | 8.5°C | 0.3°C | 24.2°C3 November 2015 | −14.3°C13 November 2019 | 19 / 19 |
| December | 2.7°C | −3.5°C | 16.8°C11 December 2021 | −20.9°C19 December 2016 | 19 / 19 |
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 19 to 21 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.