Number of Days of 20 °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 20 degrees Celsius in Thunder Bay, Ontario, between 1941 and 2024.

Also see:

Which year had the most 20° days?

Based on NOAA records, the year 2015 holds the record for the most 20 °C days in Thunder Bay history. There were 109 days with a high temperature of at least 20 degrees that year.

How many so far this year (2024)?

It has not reached 20 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 20° C was October 4, 2023.

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

Year	Rank	Days >= 20 °C
2024	84	0
2023	7	103
2022	28	93
2021	12	99
2020	37	91
2019	40	90
2018	15	98
2017	67	78
2016	12	99
2015	1	109
2014	44	89
2013	52	86
2012	3	107
2011	22	95
2010	19	96
2009	33	92
2008	22	95
2007	17	97
2006	6	104
2005	5	105
2004	81	59
2003	10	101
2002	10	101
2001	7	103
2000	40	90
1999	27	94
1998	2	108
1997	33	92
1996	55	85
1995	44	89
1994	49	87
1993	82	57
1992	74	73
1991	17	97
1990	40	90
1989	22	95
1988	19	96
1987	28	93
1986	61	83
1985	67	78
1984	55	85
1983	37	91
1982	75	71
1981	55	85
1980	37	91
1979	67	78
1978	64	81
1977	79	68
1976	12	99
1975	22	95
1974	61	83
1973	55	85
1972	60	84
1971	52	86
1970	52	86
1969	66	79
1968	75	71
1967	65	80
1966	49	87
1965	80	66
1964	77	69
1963	33	92
1962	70	77
1961	19	96
1960	28	93
1959	28	93
1958	72	76
1957	46	88
1956	70	77
1955	9	102
1954	73	74
1953	46	88
1952	15	98
1951	63	82
1950	77	69
1949	40	90
1948	4	106
1947	33	92
1946	49	87
1945	55	85
1944	28	93
1943	46	88
1942	22	95
1941	83	32

Weather Station Details

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