Hart Island climate by month
Averages and records for each calendar month at Hart Island , Canada, from 1993 to 2026. The warmest month is August, averaging 21.9°C; the coolest is February at 0.3°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 1.0°C | −5.6°C | 12.0°C17 January 1995 | −21.2°C2 January 1999 | 29 / 32 |
| February | 0.3°C | −6.0°C | 11.3°C17 February 2016 | −24.9°C4 February 2023 | 27 / 32 |
| March | 2.2°C | −3.5°C | 17.1°C31 March 1998 | −18.5°C11 March 2017 | 30 / 33 |
| April | 6.0°C | 0.3°C | 18.2°C4 April 2010 | −11.9°C5 April 1995 | 31 / 32 |
| May | 11.0°C | 4.1°C | 25.9°C28 May 2025 | −7.2°C15 May 2005 | 27 / 32 |
| June | 15.8°C | 8.8°C | 28.0°C1 June 2023 | 2.2°C9 June 1997 | 27 / 32 |
| July | 20.5°C | 13.8°C | 30.2°C4 July 2018 | 8.9°C8 July 2009 | 27 / 31 |
| August | 21.9°C | 15.9°C | 30.0°C31 August 2010 | 10.1°C31 August 2002 | 26 / 32 |
| September | 19.0°C | 13.1°C | 31.4°C2 September 2010 | 3.7°C25 September 1997 | 27 / 31 |
| October | 13.6°C | 8.0°C | 23.9°C6 October 2025 | −0.8°C16 October 1996 | 30 / 31 |
| November | 8.5°C | 2.8°C | 17.7°C3 November 2018 | −11.6°C22 November 2018 | 28 / 30 |
| December | 4.0°C | −1.8°C | 14.3°C10 December 2017 | −15.5°C28 December 2017 | 27 / 32 |
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 26 to 31 years each.
See what Hart Island 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.