Sarnia/Hadfield Arpt climate by month
Averages and records for each calendar month at Sarnia/Hadfield Arpt, Canada, from 2009 to 2026. The warmest month is July, averaging 27.1°C; the coolest is January at −0.7°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | −0.7°C | −7.4°C | 16.0°C9 January 2026 | −25.2°C7 January 2014 | 17 / 17 |
| February | 0.6°C | −7.5°C | 20.7°C27 February 2024 | −28.0°C16 February 2015 | 17 / 17 |
| March | 6.3°C | −2.8°C | 27.9°C21 March 2012 | −21.3°C3 March 2014 | 17 / 17 |
| April | 12.5°C | 1.9°C | 28.4°C15 April 2010 | −7.0°C16 April 2014 | 17 / 17 |
| May | 19.1°C | 7.8°C | 32.2°C28 May 2012 | −2.6°C13 May 2020 | 16 / 16 |
| June | 24.3°C | 13.4°C | 34.7°C8 June 2011 | 4.9°C7 June 2015 | 16 / 16 |
| July | 27.1°C | 16.9°C | 36.4°C17 July 2012 | 8.4°C1 July 2010 | 16 / 16 |
| August | 26.0°C | 15.9°C | 35.0°C12 August 2016 | 6.9°C26 August 2017 | 16 / 16 |
| September | 22.5°C | 12.0°C | 35.8°C10 September 2013 | 1.5°C19 September 2020 | 15 / 16 |
| October | 16.2°C | 7.0°C | 30.4°C4 October 2025 | −4.2°C31 October 2020 | 14 / 15 |
| November | 8.3°C | 0.2°C | 23.9°C3 November 2015 | −14.1°C13 November 2019 | 15 / 15 |
| December | 2.8°C | −3.3°C | 16.9°C11 December 2021 | −20.2°C19 December 2016 | 15 / 16 |
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 14 to 17 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.