Sisters Isl climate by month
Averages and records for each calendar month at Sisters Isl, Canada, from 1993 to 2026. The warmest month is August, averaging 21.3°C; the coolest is December at 7.1°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 7.3°C | 4.5°C | 15.5°C29 January 2024 | −7.6°C12 January 2024 | 28 / 30 |
| February | 7.6°C | 4.5°C | 14.4°C17 February 2023 | −3.7°C3 February 2019 | 27 / 29 |
| March | 9.3°C | 5.6°C | 19.2°C29 March 2004 | −2.9°C7 March 2002 | 26 / 29 |
| April | 12.0°C | 7.6°C | 22.0°C30 April 1998 | 1.1°C4 April 2020 | 26 / 28 |
| May | 15.8°C | 10.9°C | 28.8°C14 May 2023 | 3.4°C6 May 2002 | 26 / 28 |
| June | 18.5°C | 13.6°C | 31.7°C27 June 2021 | 6.9°C1 June 1999 | 27 / 28 |
| July | 21.2°C | 15.9°C | 30.8°C29 July 2009 | 10.9°C17 July 1996 | 25 / 28 |
| August | 21.3°C | 16.3°C | 29.7°C16 August 2022 | 11.4°C30 August 2008 | 26 / 29 |
| September | 18.2°C | 13.6°C | 28.5°C2 September 2022 | 8.1°C29 September 2009 | 25 / 28 |
| October | 13.2°C | 9.8°C | 24.5°C7 October 2022 | 3.9°C31 October 2006 | 23 / 28 |
| November | 9.5°C | 6.5°C | 17.8°C6 November 2006 | −5.2°C22 November 2010 | 24 / 28 |
| December | 7.1°C | 4.4°C | 16.4°C1 December 2021 | −6.7°C27 December 2021 | 26 / 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 23 to 28 years each.
See what Sisters Isl is doing right now
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.