Ottawa April 21 Weather Records

Daily averages and all-time records for weather in Ottawa, Ontario for the date of April 21.
April 21 All-Time Records
1889–2024
Highest temperature 28.2 °C 1987
Lowest temperature -9.4 °C 1916
Lowest daily high 2.0 °C 1983
Highest daily low 13.9 °C 1977
Most precipitation 3.12 cm 1991
Most snow 2.5 cm 1905
April 21 Average Weather
1991–2020 1
Average high 13.3 °C
Average low 2.7 °C
Chance precipitation 41.5%
Chance snow 4.6%
Ottawa April 21 Weather by Year
Year High (°C) Low (°C) Precip. (cm) Snow (cm)
2023 16.0 3.0 0.10 0.0
2022 13.0 2.0 2.16 0.0
2021 3.5 -3.5 0.06 1.0
2020 n/a n/a n/a n/a
2019 12.5 6.0 0.00 0.0
2018 12.0 -1.0 0.00 0.0
2017 14.0 6.0 0.14 0.0
2016 22.0 0.5 0.52 0.0
2015 12.0 6.5 0.26 0.0
2014 18.2 7.0 0.46 0.0
2013 6.8 -4.0 0.00 0.0
2012 6.0 3.5 0.37 0.0
2011 8.3 -1.3 0.00 0.0
2010 18.1 4.2 0.00 0.0
2009 8.2 3.6 0.79 0.0
2008 24.8 8.0 0.00 0.0
2007 23.2 3.6 0.00 0.0
2006 18.8 6.5 0.00 0.0
2005 10.4 -0.5 0.00 0.0
2004 22.0 4.5 0.99 0.0
2003 14.8 11.5 1.32 0.0
2002 5.3 -1.6 0.00 0.0
2001 18.8 4.2 0.20 0.0
2000 7.0 3.3 0.98 0.0
1999 15.4 3.7 0.00 0.0
1998 17.8 1.5 0.00 0.0
1997 14.5 2.7 0.00 0.0
1996 17.6 10.0 0.00 0.0
1995 13.0 4.6 0.62 0.0
1994 7.5 -2.1 0.00 0.0
1993 3.2 0.4 0.38 0.0
1992 21.5 11.7 1.16 0.0
1991 9.0 3.1 3.12 0.0
1990 14.0 6.1 0.00 0.0
1989 12.8 -2.4 0.00 0.0
1988 9.5 1.6 0.00 0.0
1987 28.2 13.2 0.06 0.0
1986 15.1 10.5 0.07 0.0
1985 23.1 5.2 0.04 0.0
1984 7.5 -1.0 0.00 0.0
1983 2.0 -3.0 0.08 0.8
1982 4.5 1.0 0.00 0.0
1981 4.0 -7.5 0.00 0.0
1980 12.5 3.0 0.00 0.0
1979 19.5 2.5 0.02 0.0
1978 10.0 2.0 0.00 0.0
1977 25.0 13.9 0.46 0.0
1976 20.6 6.7 1.70 0.0
1975 5.6 -3.9 0.00 0.0
1974 22.8 -0.6 0.18 0.0
1973 23.3 8.3 0.03 0.0
1972 9.4 -1.1 0.00 0.0
1971 5.0 3.3 0.43 0.0
1970 11.1 1.7 0.20 0.0
1969 15.6 1.1 0.74 0.0
1968 18.9 6.1 0.00 0.0
1967 7.2 1.1 1.40 0.0
1966 20.6 6.1 0.18 0.0
1965 11.1 -2.8 0.89 0.0
1964 12.2 2.8 1.37 0.0
1963 12.8 5.6 0.56 0.0
1962 18.3 -0.6 0.05 0.0
1961 19.4 -1.1 0.33 0.0
1960 14.4 3.3 0.58 0.0
1959 8.3 -2.8 0.00 0.0
1958 16.7 10.0 0.03 0.0
1957 18.9 12.8 0.00 0.0
1956 5.0 -3.9 0.43 0.0
1955 8.9 3.9 0.00 0.0
1954 16.7 6.7 0.00 0.0
1953 9.4 0.6 0.00 0.0
1952 16.1 2.2 0.00 0.0
1951 10.0 -2.2 n/a n/a
1950 9.4 0.0 0.00 0.0
1949 13.3 7.8 0.08 0.0
1948 13.3 3.9 0.00 0.0
1947 3.3 -6.7 0.00 0.0
1946 11.7 -0.6 0.00 0.0
1945 8.3 -3.3 0.25 0.0
1944 12.2 1.7 0.00 0.0
1943 7.2 0.6 0.00 0.0
1942 14.4 2.2 0.00 0.0
1941 9.4 5.6 0.00 0.0
1940 3.9 2.2 0.28 0.0
1939 7.2 -1.7 0.23 0.0
1938 14.4 1.1 0.97 0.0
1937 8.3 -3.3 1.45 0.0
1936 6.7 2.2 0.00 0.0
1935 11.1 1.1 0.00 0.0
1934 6.7 -0.6 0.00 0.0
1933 18.9 -0.6 0.00 0.0
1932 21.1 -1.1 0.00 0.0
1931 25.6 6.1 0.00 0.0
1930 10.0 -3.3 0.08 0.0
1929 13.3 4.4 0.00 0.0
1928 6.7 -7.2 0.00 0.0
1927 20.6 0.6 0.00 0.0
1926 12.8 -1.1 0.00 0.0
1925 12.2 -5.6 0.00 0.0
1924 12.2 -0.6 0.00 0.0
1923 27.2 6.7 0.00 0.0
1922 5.6 -5.0 0.00 0.0
1921 13.3 5.6 0.38 0.0
1920 13.3 5.6 0.25 0.0
1919 11.7 -1.1 0.00 0.0
1918 7.8 2.8 0.69 0.0
1917 18.9 6.1 0.86 0.0
1916 11.1 -9.4 0.00 0.0
1915 13.9 -2.2 0.00 0.0
1914 11.1 -1.1 0.00 0.0
1913 17.2 -2.2 0.00 0.0
1912 17.8 -1.1 0.00 0.0
1911 10.0 -1.7 0.00 0.0
1910 15.6 5.6 0.00 0.0
1909 10.0 -0.6 0.25 0.0
1908 8.3 -6.7 0.00 0.0
1907 9.4 -6.7 0.00 0.0
1906 15.0 5.6 0.58 0.0
1905 12.2 -2.2 0.25 2.5
1904 7.8 -2.8 0.00 0.0
1903 10.0 -1.7 0.00 0.0
1902 10.0 1.7 0.08 0.0
1901 14.4 1.7 1.63 0.0
1900 23.9 4.4 0.00 0.0
1899 13.9 2.2 0.00 0.0
1898 10.6 2.8 0.48 0.0
1897 13.3 -3.9 0.00 0.0
1896 14.4 1.1 0.00 0.0
1895 21.1 1.7 0.00 0.0
1894 17.8 9.4 0.00 0.0
1893 8.9 0.6 1.19 0.0
1892 17.2 -1.1 0.15 0.0
1891 18.9 1.1 0.00 0.0
1890 12.2 1.1 0.00 0.0
What's the all-time high for Ottawa on 4/21?
For the date of Apr 21, the highest temperature ever reached in Ottawa history is 28.2 °C which happened in 1987.
Highest Temperatures in Ottawa on April 21
Rank Temperature Year
1 28.2 °C 1987
2 27.2 °C 1923
3 25.6 °C 1931
4 25.0 °C 1977
5 24.8 °C 2008
6 23.9 °C 1900
7 23.3 °C 1973
8 23.2 °C 2007
9 23.1 °C 1985
10 22.8 °C 1974
What's the all-time low for Ottawa on 4/21?
For the date of Apr 21, the lowest temperature ever reached in Ottawa history is -9.4 °C which happened in 1916.
Lowest Temperatures in Ottawa on April 21
Rank Temperature Year
1 -9.4 °C 1916
2 -7.5 °C 1981
3 -7.2 °C 1928
4 -6.7 °C 1908
4 -6.7 °C 1907
4 -6.7 °C 1947
7 -5.6 °C 1925
8 -5.0 °C 1922
9 -4.0 °C 2013
10 -3.9 °C 1956
10 -3.9 °C 1897
10 -3.9 °C 1975
Lowest High Temperatures in Ottawa on April 21
Rank Temperature Year
1 2.0 °C 1983
2 3.2 °C 1993
3 3.3 °C 1947
4 3.5 °C 2021
5 3.9 °C 1940
6 4.0 °C 1981
7 4.5 °C 1982
8 5.0 °C 1956
8 5.0 °C 1971
10 5.3 °C 2002
What's the most it has ever rained in Ottawa on 4/21?
For the date of Apr 21, the most precipitation ever recorded in Ottawa history is 3.12 cm which happened in 1991.
All-Time Most Precipitation in Ottawa on April 21
Rank Precipitation Year
1 3.12 cm 1991
2 2.16 cm 2022
3 1.70 cm 1976
4 1.63 cm 1901
5 1.45 cm 1937
6 1.40 cm 1967
7 1.37 cm 1964
8 1.32 cm 2003
9 1.19 cm 1893
10 1.16 cm 1992
All-Time Most Snow in Ottawa on April 21
Rank Precipitation Year
1 2.5 cm 1905
2 1.0 cm 2021
3 0.8 cm 1983
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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