Ottawa/Cartier Intl climate by month
Averages and records for each calendar month at Ottawa/Cartier Intl, Canada, from 2011 to 2024. The warmest month is July, averaging 27.8°C; the coolest is January at −4.6°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | −4.6°C | −13.7°C | 11.9°C12 January 2018 | −30.2°C1 January 2018 | 13 / 13 |
| February | −3.0°C | −12.9°C | 15.7°C28 February 2024 | −33.1°C4 February 2023 | 13 / 13 |
| March | 2.8°C | −6.8°C | 27.4°C21 March 2012 | −23.5°C6 March 2015 | 13 / 13 |
| April | 11.4°C | 0.1°C | 30.2°C13 April 2023 | −11.6°C5 April 2018 | 12 / 13 |
| May | 20.5°C | 7.2°C | 35.0°C27 May 2020 | −4.6°C12 May 2020 | 12 / 12 |
| June | 24.6°C | 12.2°C | 35.1°C1 June 2023 | 0.7°C1 June 2020 | 12 / 12 |
| July | 27.8°C | 15.1°C | 36.9°C10 July 2020 | 7.8°C25 July 2013 | 12 / 12 |
| August | 26.1°C | 14.2°C | 35.4°C4 August 2012 | 5.3°C31 August 2017 | 12 / 12 |
| September | 21.8°C | 9.5°C | 33.0°C25 September 2017 | −0.4°C19 September 2020 | 12 / 12 |
| October | 14.4°C | 4.1°C | 30.9°C3 October 2023 | −8.4°C31 October 2020 | 12 / 12 |
| November | 5.4°C | −3.7°C | 23.4°C10 November 2020 | −21.2°C23 November 2018 | 12 / 12 |
| December | −1.2°C | −8.6°C | 17.9°C4 December 2012 | −28.1°C16 December 2016 | 12 / 13 |
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 12 to 13 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.