Harrow climate by month
Averages and records for each calendar month at Harrow, Canada, from 2000 to 2026. The warmest month is July, averaging 27.7°C; the coolest is January at −0.3°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | −0.3°C | −6.9°C | 15.1°C7 January 2008 | −26.7°C25 January 2004 | 25 / 25 |
| February | 1.1°C | −6.3°C | 19.5°C27 February 2024 | −24.9°C12 February 2014 | 25 / 25 |
| March | 7.0°C | −1.7°C | 24.5°C21 March 2012 | −22.8°C3 March 2003 | 24 / 26 |
| April | 13.8°C | 3.4°C | 27.7°C26 April 2009 | −7.6°C1 April 2019 | 25 / 26 |
| May | 19.8°C | 9.4°C | 32.1°C28 May 2012 | −3.3°C8 May 2020 | 24 / 26 |
| June | 25.4°C | 15.3°C | 35.2°C25 June 2005 | 4.2°C4 June 2009 | 23 / 26 |
| July | 27.7°C | 17.5°C | 37.8°C21 July 2011 | 7.3°C2 July 2001 | 23 / 26 |
| August | 26.4°C | 16.7°C | 35.8°C8 August 2001 | 6.4°C30 August 2025 | 25 / 27 |
| September | 23.0°C | 12.9°C | 33.3°C10 September 2013 | 1.6°C19 September 2020 | 25 / 27 |
| October | 16.3°C | 7.3°C | 30.3°C1 October 2019 | −4.4°C30 October 2008 | 23 / 26 |
| November | 9.0°C | 1.4°C | 22.8°C4 November 2003 | −15.6°C13 November 2019 | 23 / 25 |
| December | 2.5°C | −3.5°C | 17.6°C5 December 2001 | −21.9°C27 December 2004 | 24 / 25 |
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 23 to 25 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.