Barrie/Lake Simcoe Rgnl climate by month
Averages and records for each calendar month at Barrie/Lake Simcoe Rgnl, Canada, from 2003 to 2026. The warmest month is July, averaging 25.8°C; the coolest is January at −3.5°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | −3.5°C | −12.6°C | 13.2°C13 January 2005 | −35.3°C22 January 2014 | 23 / 23 |
| February | −2.6°C | −12.8°C | 13.7°C27 February 2024 | −33.3°C14 February 2016 | 23 / 23 |
| March | 3.1°C | −7.2°C | 25.9°C21 March 2012 | −28.3°C10 March 2008 | 23 / 23 |
| April | 10.7°C | −0.4°C | 29.6°C13 April 2023 | −15.7°C5 April 2018 | 22 / 23 |
| May | 18.4°C | 5.3°C | 32.4°C30 May 2006 | −5.5°C8 May 2020 | 22 / 22 |
| June | 23.1°C | 10.9°C | 34.1°C23 June 2025 | 0.9°C3 June 2009 | 22 / 22 |
| July | 25.8°C | 13.6°C | 34.0°C24 July 2025 | 4.5°C15 July 2009 | 22 / 22 |
| August | 24.6°C | 12.5°C | 35.2°C1 August 2006 | 2.3°C22 August 2004 | 22 / 22 |
| September | 21.0°C | 8.7°C | 33.0°C5 September 2018 | −1.1°C19 September 2009 | 21 / 22 |
| October | 13.6°C | 3.6°C | 28.5°C3 October 2023 | −8.1°C31 October 2020 | 21 / 21 |
| November | 6.6°C | −2.4°C | 24.3°C10 November 2020 | −24.2°C13 November 2019 | 21 / 22 |
| December | −0.2°C | −7.5°C | 16.6°C16 December 2021 | −35.4°C20 December 2004 | 22 / 22 |
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 21 to 23 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.