Number of Days of 40 °C in Thunder Bay by Year

This page contains a list of the number of days in each year that the high temperature equaled or exceeded 40 degrees Celsius in Thunder Bay, Ontario, between 1941 and 2024.

Also see:

Which year had the most 40° days?

Based on NOAA records, the year 1983 holds the record for the most 40 °C days in Thunder Bay history. There were 1 days with a high temperature of at least 40 degrees that year.

How many so far this year (2024)?

It has not reached 40 degrees Celsius in Thunder Bay so far in 2024. As of April 9, the highest temperature this year is 61 °F.

The last time it reached at least 40° C was August 7, 1983.

Years marked with a gold background have more than 5% incomplete data
Click column headers to sort

Year	Rank	Days >= 40 °C
2024	2	0
2023	2	0
2022	2	0
2021	2	0
2020	2	0
2019	2	0
2018	2	0
2017	2	0
2016	2	0
2015	2	0
2014	2	0
2013	2	0
2012	2	0
2011	2	0
2010	2	0
2009	2	0
2008	2	0
2007	2	0
2006	2	0
2005	2	0
2004	2	0
2003	2	0
2002	2	0
2001	2	0
2000	2	0
1999	2	0
1998	2	0
1997	2	0
1996	2	0
1995	2	0
1994	2	0
1993	2	0
1992	2	0
1991	2	0
1990	2	0
1989	2	0
1988	2	0
1987	2	0
1986	2	0
1985	2	0
1984	2	0
1983	1	1
1982	2	0
1981	2	0
1980	2	0
1979	2	0
1978	2	0
1977	2	0
1976	2	0
1975	2	0
1974	2	0
1973	2	0
1972	2	0
1971	2	0
1970	2	0
1969	2	0
1968	2	0
1967	2	0
1966	2	0
1965	2	0
1964	2	0
1963	2	0
1962	2	0
1961	2	0
1960	2	0
1959	2	0
1958	2	0
1957	2	0
1956	2	0
1955	2	0
1954	2	0
1953	2	0
1952	2	0
1951	2	0
1950	2	0
1949	2	0
1948	2	0
1947	2	0
1946	2	0
1945	2	0
1944	2	0
1943	2	0
1942	2	0
1941	2	0

Weather Station Details

Years	Station	Coordinates
2004–2024	Thunder Bay CS	location
1941–2003	Thunder Bay A	location