HAMILTON RBG CS, ONT weather by month
Averages and records for each calendar month at HAMILTON RBG CS, ONT, Canada, from 1997 to 2026. The warmest month is July, averaging 27.6°C; the coolest is January at −0.1°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | −0.1°C | −7.7°C | 18.1°C13 January 2005 | −25.4°C27 January 2003 | 27 / 28 |
| February | 1.2°C | −7.5°C | 18.8°C23 February 2017 | −27.3°C16 February 2015 | 28 / 28 |
| March | 6.0°C | −3.3°C | 26.5°C22 March 2012 | −24.7°C3 March 2003 | 28 / 28 |
| April | 12.4°C | 2.1°C | 29.4°C16 April 2002 | −11.5°C5 April 2016 | 28 / 28 |
| May | 19.2°C | 7.6°C | 35.0°C29 May 2006 | −2.2°C1 May 2008 | 27 / 28 |
| June | 24.7°C | 13.1°C | 35.2°C22 June 2025 | 1.1°C4 June 1998 | 27 / 28 |
| July | 27.6°C | 15.7°C | 38.1°C17 July 2012 | 7.4°C3 July 2015 | 27 / 27 |
| August | 26.6°C | 15.1°C | 37.3°C8 August 2001 | 6.0°C22 August 2004 | 27 / 27 |
| September | 23.0°C | 11.4°C | 34.9°C6 September 2007 | −0.8°C29 September 2000 | 26 / 27 |
| October | 15.7°C | 5.8°C | 31.7°C8 October 2007 | −6.1°C31 October 2020 | 26 / 26 |
| November | 9.1°C | 0.7°C | 25.9°C5 November 2022 | −13.7°C22 November 2018 | 26 / 26 |
| December | 3.1°C | −3.7°C | 19.6°C6 December 1998 | −21.4°C20 December 2004 | 26 / 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 26 to 28 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.