Number of Days of 20 °C in London 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 London, Ontario, between 1883 and 2024.

Also see:

Which year had the most 20° days?

Based on NOAA records, the year 1921 holds the record for the most 20 °C days in London history. There were 160 days with a high temperature of at least 20 degrees that year.

How many so far this year (2024)?

As of April 27, there have been 3 days this year where the high temperature has reached at least 20 degrees Celsius in London, Ontario.

The last time it reached at least 20° C was April 27, 2024.

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

Year	Rank	Days >= 20 °C
2024	142	3
2023	128	115
2022	61	130
2021	14	142
2020	91	124
2019	95	123
2018	9	144
2017	42	134
2016	21	140
2015	28	138
2014	118	117
2013	68	129
2012	14	142
2011	68	129
2010	61	130
2009	118	117
2008	78	127
2007	11	143
2006	82	126
2005	42	134
2004	61	130
2003	113	118
2002	61	130
2001	87	125
2000	82	126
1999	14	142
1998	14	142
1997	131	114
1996	123	116
1995	91	124
1994	113	118
1993	136	111
1992	135	113
1991	21	140
1990	68	129
1989	61	130
1988	108	119
1987	106	120
1986	103	121
1985	46	133
1984	131	114
1983	131	114
1982	108	119
1981	118	117
1980	118	117
1979	118	117
1978	106	120
1977	87	125
1976	99	122
1975	72	128
1974	113	118
1973	72	128
1972	128	115
1971	34	136
1970	42	134
1969	113	118
1968	103	121
1967	103	121
1966	123	116
1965	95	123
1964	99	122
1963	14	142
1962	34	136
1961	72	128
1960	30	137
1959	34	136
1958	91	124
1957	54	131
1956	137	109
1955	30	137
1954	72	128
1953	51	132
1952	82	126
1951	39	135
1950	87	125
1949	28	138
1948	78	127
1947	99	122
1946	54	131
1945	123	116
1944	46	133
1943	95	123
1942	72	128
1941	11	143
1940	128	115
1939	39	135
1938	39	135
1937	108	119
1936	46	133
1935	139	105
1934	54	131
1933	61	130
1932	123	116
1931	19	141
1930	9	144
1929	78	127
1928	87	125
1927	46	133
1926	54	131
1925	68	129
1924	123	116
1923	30	137
1922	4	151
1921	1	160
1920	2	153
1919	24	139
1918	46	133
1917	131	114
1916	54	131
1915	61	130
1914	21	140
1913	24	139
1912	51	132
1911	7	146
1910	24	139
1909	51	132
1908	5	149
1907	108	119
1906	11	143
1905	34	136
1904	72	128
1903	54	131
1902	108	119
1901	30	137
1900	2	153
1899	8	145
1898	19	141
1897	42	134
1896	5	149
1895	24	139
1894	34	136
1893	82	126
1892	82	126
1891	54	131
1890	141	29
1889	99	122
1888	113	118
1887	91	124
1886	78	127
1885	139	105
1884	95	123
1883	138	108

Weather Station Details

Years	Station	Coordinates
2002–2024	London CS	location
1941–2002	London International Airport	location
1932–1940	London Lambeth A	location
1883–1931	London South	location