Thunder Bay Intl climate by month
Averages and records for each calendar month at Thunder Bay Intl, Canada, from 1941 to 2004. The warmest month is July, averaging 24.2°C; the coolest is January at −8.8°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | −8.8°C | −20.9°C | 8.3°C23 January 1942 | −43.2°C31 January 1996 | 62 / 63 |
| February | −5.7°C | −18.9°C | 15.5°C29 February 2000 | −40.6°C1 February 1996 | 61 / 63 |
| March | 0.2°C | −11.8°C | 22.8°C28 March 1946 | −36.7°C2 March 1943 | 61 / 63 |
| April | 8.5°C | −3.5°C | 28.3°C24 April 1942 | −22.2°C4 April 1954 | 63 / 63 |
| May | 15.6°C | 1.9°C | 35.2°C30 May 1986 | −8.9°C4 May 1954 | 63 / 63 |
| June | 20.8°C | 7.3°C | 39.0°C18 June 1995 | −2.8°C7 June 1949 | 62 / 63 |
| July | 24.2°C | 10.8°C | 37.2°C30 July 1975 | 0.0°C6 July 1969 | 63 / 63 |
| August | 23.1°C | 10.0°C | 40.3°C7 August 1983 | −1.1°C29 August 1976 | 64 / 64 |
| September | 17.5°C | 5.2°C | 33.1°C5 September 1998 | −8.3°C25 September 1942 | 64 / 64 |
| October | 11.0°C | −0.1°C | 28.3°C8 October 1943 | −13.3°C28 October 1942 | 64 / 64 |
| November | 1.8°C | −7.2°C | 21.7°C4 November 1975 | −30.6°C30 November 1976 | 63 / 64 |
| December | −5.5°C | −16.0°C | 12.2°C3 December 1962 | −37.8°C13 December 1976 | 62 / 64 |
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 64 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.