St Johns Intl climate by month
Averages and records for each calendar month at St Johns Intl, Canada, from 1942 to 2012. The warmest month is July, averaging 20.4°C; the coolest is February at −1.1°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | −0.6°C | −7.6°C | 15.7°C15 January 2006 | −23.3°C29 January 1957 | 70 / 71 |
| February | −1.1°C | −8.3°C | 16.0°C24 February 1996 | −23.8°C18 February 1990 | 70 / 71 |
| March | 0.9°C | −5.8°C | 18.3°C31 March 1962 | −23.8°C10 March 1986 | 69 / 71 |
| April | 4.9°C | −2.1°C | 24.1°C24 April 1986 | −14.8°C4 April 1978 | 69 / 70 |
| May | 10.4°C | 1.4°C | 25.6°C30 May 1972 | −6.7°C5 May 1964 | 69 / 70 |
| June | 15.6°C | 5.8°C | 29.4°C29 June 1944 | −3.3°C1 June 1970 | 69 / 70 |
| July | 20.4°C | 10.7°C | 31.5°C6 July 1983 | −1.1°C5 July 1976 | 69 / 70 |
| August | 19.9°C | 11.4°C | 31.0°C7 August 1996 | 0.5°C24 August 1983 | 69 / 70 |
| September | 16.1°C | 7.9°C | 29.5°C10 September 2001 | −1.1°C23 September 1950 | 70 / 70 |
| October | 10.7°C | 3.7°C | 24.6°C4 October 1987 | −5.6°C31 October 1946 | 70 / 70 |
| November | 6.4°C | 0.0°C | 19.4°C6 November 1950 | −12.6°C23 November 1978 | 70 / 70 |
| December | 1.7°C | −4.7°C | 17.3°C13 December 2008 | −19.7°C27 December 1984 | 68 / 70 |
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 68 to 70 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.