St Catharines/Niagara Arpt climate by month
Averages and records for each calendar month at St Catharines/Niagara Arpt, Canada, from 1971 to 2000. The warmest month is July, averaging 27.1°C; the coolest is January at −0.4°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | −0.4°C | −7.9°C | 18.5°C14 January 1995 | −23.8°C19 January 1994 | 28 / 29 |
| February | 0.3°C | −7.3°C | 19.4°C21 February 1997 | −25.7°C18 February 1979 | 29 / 29 |
| March | 5.5°C | −3.3°C | 26.7°C31 March 1998 | −21.1°C12 March 1993 | 29 / 29 |
| April | 12.2°C | 2.0°C | 30.3°C25 April 1990 | −9.1°C7 April 1982 | 29 / 29 |
| May | 19.4°C | 7.8°C | 32.4°C29 May 1987 | −1.7°C2 May 1974 | 28 / 28 |
| June | 24.3°C | 13.3°C | 35.0°C19 June 1995 | 1.7°C11 June 1972 | 29 / 30 |
| July | 27.1°C | 16.4°C | 37.4°C7 July 1988 | 8.0°C8 July 1984 | 30 / 30 |
| August | 25.9°C | 15.7°C | 35.6°C28 August 1973 | 2.6°C29 August 1982 | 30 / 30 |
| September | 21.5°C | 11.6°C | 33.3°C4 September 1973 | 0.4°C29 September 1991 | 30 / 30 |
| October | 14.9°C | 5.7°C | 28.9°C2 October 1971 | −5.0°C31 October 1975 | 30 / 30 |
| November | 8.3°C | 0.8°C | 22.2°C3 November 1977 | −10.6°C30 November 1976 | 30 / 30 |
| December | 2.4°C | −4.4°C | 21.9°C3 December 1982 | −22.5°C25 December 1980 | 28 / 30 |
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 28 to 30 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.