Onatchiway climate by month
Averages and records for each calendar month at Onatchiway, Canada, from 1997 to 2026. The warmest month is July, averaging 23.5°C; the coolest is January at −9.1°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | −9.1°C | −22.0°C | 10.4°C13 January 2005 | −43.9°C2 January 2014 | 27 / 29 |
| February | −6.9°C | −21.8°C | 12.1°C27 February 2000 | −43.6°C15 February 2003 | 25 / 29 |
| March | −0.2°C | −15.1°C | 22.2°C21 March 2012 | −40.0°C5 March 2014 | 29 / 29 |
| April | 7.3°C | −5.5°C | 23.7°C25 April 2009 | −30.4°C5 April 2016 | 29 / 29 |
| May | 16.3°C | 1.2°C | 32.6°C31 May 2023 | −10.8°C1 May 2008 | 26 / 28 |
| June | 21.5°C | 6.8°C | 34.5°C24 June 2003 | −4.7°C2 June 2020 | 26 / 27 |
| July | 23.5°C | 10.1°C | 35.4°C2 July 2002 | 0.3°C2 July 2003 | 25 / 28 |
| August | 22.3°C | 9.1°C | 32.8°C12 August 2025 | −1.1°C25 August 2003 | 26 / 29 |
| September | 17.6°C | 5.1°C | 31.3°C6 September 2023 | −5.5°C24 September 2018 | 27 / 29 |
| October | 9.9°C | 0.4°C | 26.6°C5 October 2025 | −14.1°C27 October 2018 | 25 / 28 |
| November | 1.7°C | −6.0°C | 20.8°C3 November 1999 | −27.0°C20 November 2018 | 25 / 28 |
| December | −5.5°C | −15.9°C | 12.4°C18 December 2023 | −38.9°C14 December 2013 | 28 / 28 |
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 25 to 29 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.