Ottawa May 21 Weather Records

Daily averages and all-time records for weather in Ottawa, Ontario for the date of May 21.
May 21 All-Time Records
1889–2024
Highest temperature 35.0 °C 1921
Lowest temperature -2.8 °C 1926
Lowest daily high 7.8 °C 1892
Highest daily low 17.8 °C 1911
Most precipitation 2.90 cm 1923
Most snow none -
May 21 Average Weather
1991–2020 1
Average high 20.3 °C
Average low 9.1 °C
Chance precipitation 43.0%
Chance snow 0.2%
Ottawa May 21 Weather by Year
Year High (°C) Low (°C) Precip. (cm) Snow (cm)
2023 22.0 11.0 0.04 0.0
2022 31.0 16.5 1.44 0.0
2021 32.0 16.0 0.00 0.0
2020 25.0 15.5 0.00 0.0
2019 18.0 7.0 0.00 0.0
2018 25.5 9.0 0.00 0.0
2017 17.0 9.0 1.42 0.0
2016 25.5 9.0 0.00 0.0
2015 20.5 7.4 0.00 0.0
2014 24.0 8.7 0.00 0.0
2013 17.5 13.8 1.38 0.0
2012 29.1 17.4 0.31 0.0
2011 26.1 12.6 0.00 0.0
2010 23.2 11.0 0.00 0.0
2009 29.0 10.2 0.00 0.0
2008 10.2 5.0 0.15 0.0
2007 17.3 3.7 0.00 0.0
2006 12.8 5.2 0.18 0.0
2005 15.6 7.2 0.28 0.0
2004 17.7 8.3 0.00 0.0
2003 16.0 5.5 0.00 0.0
2002 15.3 4.3 0.00 0.0
2001 25.1 12.5 0.32 0.0
2000 17.7 4.8 0.00 0.0
1999 22.9 4.9 0.00 0.0
1998 13.7 9.3 0.00 0.0
1997 14.5 5.5 0.20 0.0
1996 23.3 16.0 0.00 0.0
1995 22.4 8.7 0.27 0.0
1994 26.1 10.5 0.00 0.0
1993 19.0 7.2 0.00 0.0
1992 29.3 12.5 0.00 0.0
1991 27.8 9.0 0.00 0.0
1990 15.0 6.9 0.00 0.0
1989 20.1 14.4 0.21 0.0
1988 21.7 12.0 0.00 0.0
1987 20.5 10.9 0.64 0.0
1986 15.5 10.4 0.52 0.0
1985 18.9 7.6 0.00 0.0
1984 18.9 5.4 0.00 0.0
1983 17.0 8.0 0.00 0.0
1982 17.5 7.0 0.00 0.0
1981 24.0 9.0 0.00 0.0
1980 26.0 7.5 0.00 0.0
1979 18.0 11.5 1.36 0.0
1978 20.0 8.0 0.00 0.0
1977 31.5 14.0 0.00 0.0
1976 14.4 7.2 0.28 0.0
1975 30.6 17.2 0.81 0.0
1974 17.8 8.9 0.00 0.0
1973 18.3 10.6 0.03 0.0
1972 25.6 12.8 0.00 0.0
1971 18.9 10.0 0.00 0.0
1970 22.8 7.8 0.00 0.0
1969 11.7 1.1 0.00 0.0
1968 17.8 5.0 0.05 0.0
1967 10.0 1.7 0.00 0.0
1966 20.6 5.0 0.00 0.0
1965 23.3 2.8 0.03 0.0
1964 18.9 0.0 0.08 0.0
1963 17.8 3.9 0.30 0.0
1962 21.1 11.1 0.00 0.0
1961 16.1 10.6 0.23 0.0
1960 25.6 10.0 0.08 0.0
1959 24.4 16.1 0.15 0.0
1958 13.3 6.1 0.00 0.0
1957 19.4 0.0 0.00 0.0
1956 18.3 5.0 0.00 0.0
1955 26.7 3.3 0.00 0.0
1954 20.6 7.8 0.00 0.0
1953 27.2 9.4 0.91 0.0
1952 11.7 9.4 0.97 0.0
1951 27.2 14.4 0.00 0.0
1950 26.1 6.1 0.00 0.0
1949 18.9 1.7 0.00 0.0
1948 10.6 7.2 0.13 0.0
1947 9.4 5.0 2.29 0.0
1946 18.3 13.3 0.23 0.0
1945 22.2 10.0 0.00 0.0
1944 23.3 0.0 0.08 0.0
1943 15.0 12.2 0.25 0.0
1942 18.9 8.3 0.43 0.0
1941 31.1 11.1 1.91 0.0
1940 23.9 8.9 0.00 0.0
1939 20.0 8.3 0.61 0.0
1938 19.4 7.2 0.00 0.0
1937 18.3 5.0 0.00 0.0
1936 15.6 0.0 0.00 0.0
1935 13.3 3.3 0.00 0.0
1934 23.9 8.3 0.58 0.0
1933 19.4 7.8 0.00 0.0
1932 16.7 10.0 0.51 0.0
1931 19.4 12.2 0.58 0.0
1930 19.4 5.6 0.05 0.0
1929 15.6 2.8 0.00 0.0
1928 22.2 13.3 0.00 0.0
1927 18.3 6.7 0.00 0.0
1926 10.0 -2.8 0.48 0.0
1925 22.8 11.7 0.64 0.0
1924 15.0 -0.6 0.00 0.0
1923 15.0 8.9 2.90 0.0
1922 20.0 11.7 0.10 0.0
1921 35.0 16.1 0.00 0.0
1920 25.0 11.1 0.00 0.0
1919 18.3 10.6 2.08 0.0
1918 24.4 10.6 0.00 0.0
1917 16.7 1.7 0.00 0.0
1916 22.2 7.2 0.00 0.0
1915 16.7 5.0 0.05 0.0
1914 31.1 11.7 0.00 0.0
1913 15.0 3.3 0.00 0.0
1912 17.2 5.6 0.00 0.0
1911 34.4 17.8 0.00 0.0
1910 17.2 11.1 0.46 0.0
1909 20.6 11.7 0.10 0.0
1908 22.8 13.9 0.00 0.0
1907 9.4 -1.7 0.00 0.0
1906 18.9 -1.1 0.00 0.0
1905 15.6 3.9 0.00 0.0
1904 24.4 6.7 0.00 0.0
1903 27.8 12.8 0.18 0.0
1902 23.3 3.3 0.00 0.0
1901 21.7 10.6 0.00 0.0
1900 13.3 7.2 0.20 0.0
1899 n/a n/a n/a n/a
1898 25.6 7.8 0.00 0.0
1897 15.6 4.4 0.25 0.0
1896 22.2 7.2 0.00 0.0
1895 8.3 1.1 0.00 0.0
1894 18.9 8.9 0.00 0.0
1893 20.6 11.1 0.00 0.0
1892 7.8 4.4 0.25 0.0
1891 24.4 15.6 0.00 0.0
1890 17.2 2.2 0.00 0.0
What's the all-time high for Ottawa on 5/21?
For the date of May 21, the highest temperature ever reached in Ottawa history is 35.0 °C which happened in 1921.
Highest Temperatures in Ottawa on May 21
Rank Temperature Year
1 35.0 °C 1921
2 34.4 °C 1911
3 32.0 °C 2021
4 31.5 °C 1977
5 31.1 °C 1941
5 31.1 °C 1914
7 31.0 °C 2022
8 30.6 °C 1975
9 29.3 °C 1992
10 29.1 °C 2012
What's the all-time low for Ottawa on 5/21?
For the date of May 21, the lowest temperature ever reached in Ottawa history is -2.8 °C which happened in 1926.
Lowest Temperatures in Ottawa on May 21
Rank Temperature Year
1 -2.8 °C 1926
2 -1.7 °C 1907
3 -1.1 °C 1906
4 -0.6 °C 1924
5 0.0 °C 1944
5 0.0 °C 1964
5 0.0 °C 1936
5 0.0 °C 1957
9 1.1 °C 1969
9 1.1 °C 1895
Lowest High Temperatures in Ottawa on May 21
Rank Temperature Year
1 7.8 °C 1892
2 8.3 °C 1895
3 9.4 °C 1907
3 9.4 °C 1947
5 10.0 °C 1926
5 10.0 °C 1967
7 10.2 °C 2008
8 10.6 °C 1948
9 11.7 °C 1952
9 11.7 °C 1969
What's the most it has ever rained in Ottawa on 5/21?
For the date of May 21, the most precipitation ever recorded in Ottawa history is 2.90 cm which happened in 1923.
All-Time Most Precipitation in Ottawa on May 21
Rank Precipitation Year
1 2.90 cm 1923
2 2.29 cm 1947
3 2.08 cm 1919
4 1.91 cm 1941
5 1.44 cm 2022
6 1.42 cm 2017
7 1.38 cm 2013
8 1.36 cm 1979
9 0.97 cm 1952
10 0.91 cm 1953
Weather Station Details
Years Station Coordinates
1889–2024 Ottawa CDA location
Notes
1: Daily averages are a moving average which includes 14 days before and after the date.
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