Gretna, Man. climate by month
Averages and records for each calendar month at Gretna, Man., Canada, from 1955 to 2026. The warmest month is July, averaging 26.2°C; the coolest is January at −10.6°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | −10.6°C | −20.2°C | 11.5°C5 January 2012 | −40.0°C28 January 1966 | 44 / 47 |
| February | −8.2°C | −18.7°C | 15.0°C25 February 1958 | −41.1°C18 February 1966 | 44 / 47 |
| March | −0.7°C | −10.7°C | 23.3°C31 March 1963 | −37.8°C1 March 1962 | 44 / 47 |
| April | 9.5°C | −2.0°C | 28.9°C30 April 1957 | −20.6°C9 April 1997 | 43 / 46 |
| May | 18.4°C | 4.7°C | 37.2°C21 May 1964 | −10.6°C1 May 1966 | 42 / 45 |
| June | 23.8°C | 11.4°C | 41.3°C4 June 2021 | −3.9°C1 June 1964 | 42 / 45 |
| July | 26.2°C | 13.5°C | 37.2°C28 July 1959 | 2.3°C1 July 2001 | 42 / 45 |
| August | 25.8°C | 12.0°C | 37.8°C5 August 1964 | −0.6°C28 August 1965 | 41 / 44 |
| September | 20.2°C | 7.1°C | 36.0°C2 September 2023 | −6.7°C26 September 1965 | 40 / 44 |
| October | 12.1°C | 0.9°C | 31.3°C5 October 2011 | −14.0°C29 October 2023 | 39 / 44 |
| November | 0.7°C | −8.1°C | 23.0°C8 November 1999 | −30.6°C29 November 1958 | 41 / 44 |
| December | −7.3°C | −16.4°C | 11.6°C9 December 2015 | −35.6°C19 December 1955 | 42 / 45 |
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 39 to 44 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.