OTTAWA CDA RCS, ONT weather by month
Averages and records for each calendar month at OTTAWA CDA RCS, ONT, Canada, from 2000 to 2026. The warmest month is July, averaging 26.9°C; the coolest is January at −4.8°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | −4.8°C | −13.7°C | 11.8°C30 January 2013 | −31.8°C21 January 2022 | 26 / 26 |
| February | −3.0°C | −13.0°C | 15.1°C28 February 2024 | −32.5°C4 February 2023 | 26 / 26 |
| March | 2.9°C | −6.8°C | 26.5°C21 March 2012 | −28.6°C3 March 2003 | 26 / 26 |
| April | 11.6°C | 1.0°C | 30.7°C27 April 2009 | −11.3°C5 April 2004 | 25 / 26 |
| May | 19.5°C | 8.0°C | 35.2°C26 May 2010 | −2.7°C9 May 2020 | 25 / 26 |
| June | 24.2°C | 13.2°C | 35.1°C23 June 2025 | 3.4°C1 June 2020 | 25 / 26 |
| July | 26.9°C | 15.8°C | 36.4°C10 July 2020 | 6.9°C31 July 2010 | 26 / 26 |
| August | 25.7°C | 14.6°C | 37.1°C9 August 2001 | 5.9°C27 August 2009 | 26 / 26 |
| September | 21.8°C | 10.1°C | 35.3°C9 September 2002 | −0.6°C19 September 2014 | 26 / 26 |
| October | 13.8°C | 4.3°C | 30.6°C5 October 2025 | −6.8°C19 October 2015 | 24 / 27 |
| November | 6.0°C | −2.0°C | 23.0°C5 November 2022 | −21.0°C23 November 2018 | 26 / 26 |
| December | −1.3°C | −8.7°C | 17.0°C24 December 2015 | −30.3°C20 December 2004 | 25 / 26 |
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 24 to 26 years each.
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Climate at nearby stations
The closest stations with twelve months of archive of their own, nearest first.
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.