London Intl climate by month
Averages and records for each calendar month at London Intl, Canada, from 1940 to 2002. The warmest month is July, averaging 26.4°C; the coolest is January at −2.2°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | −2.2°C | −9.8°C | 16.7°C25 January 1950 | −31.7°C24 January 1970 | 62 / 62 |
| February | −1.4°C | −9.6°C | 17.8°C26 February 2000 | −29.5°C4 February 1978 | 62 / 62 |
| March | 3.8°C | −4.8°C | 24.8°C30 March 1998 | −24.8°C2 March 1978 | 62 / 62 |
| April | 11.9°C | 1.1°C | 29.4°C25 April 1990 | −12.2°C3 April 1965 | 62 / 62 |
| May | 18.6°C | 6.7°C | 32.4°C30 May 1987 | −5.0°C10 May 1947 | 62 / 62 |
| June | 24.0°C | 12.2°C | 38.2°C25 June 1988 | −0.6°C11 June 1972 | 62 / 62 |
| July | 26.4°C | 14.6°C | 36.7°C27 July 1941 | 5.0°C9 July 1963 | 62 / 63 |
| August | 25.5°C | 13.8°C | 37.0°C8 August 2001 | 1.5°C29 August 1982 | 63 / 63 |
| September | 21.2°C | 9.8°C | 34.4°C1 September 1953 | −3.3°C27 September 1965 | 63 / 63 |
| October | 14.6°C | 4.3°C | 30.0°C6 October 1946 | −11.1°C23 October 1969 | 63 / 63 |
| November | 6.9°C | −0.6°C | 24.4°C1 November 1950 | −18.3°C6 November 1951 | 61 / 62 |
| December | 0.4°C | −6.8°C | 18.5°C3 December 1982 | −26.9°C11 December 1977 | 61 / 62 |
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 61 to 63 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.