Ottawa July 21 Weather Records

Daily averages and all-time records for weather in Ottawa, Ontario for the date of July 21.
July 21 All-Time Records
1889–2024
Highest temperature 36.3 °C 2011
Lowest temperature 7.2 °C 1950
Lowest daily high 16.7 °C 1970
Highest daily low 24.0 °C 1977
Most precipitation 3.23 cm 1899
Most snow none -
July 21 Average Weather
1991–2020 1
Average high 26.9 °C
Average low 16.1 °C
Chance precipitation 40.8%
Chance snow 0%
Ottawa July 21 Weather by Year
Year High (°C) Low (°C) Precip. (cm) Snow (cm)
2023 23.5 18.0 0.92 0.0
2022 29.0 22.0 0.56 0.0
2021 25.0 15.5 0.00 0.0
2020 26.0 16.0 0.00 0.0
2019 29.5 23.0 0.00 0.0
2018 31.5 18.0 0.00 0.0
2017 28.0 16.5 0.00 0.0
2016 31.5 14.0 0.00 0.0
2015 26.3 19.2 0.05 0.0
2014 28.3 16.9 0.00 0.0
2013 22.5 12.5 0.00 0.0
2012 29.7 10.1 0.00 0.0
2011 36.3 23.3 0.00 0.0
2010 26.0 17.0 0.00 0.0
2009 25.3 13.3 0.34 0.0
2008 25.2 15.8 0.00 0.0
2007 25.1 12.5 0.00 0.0
2006 26.2 19.4 0.00 0.0
2005 31.5 17.7 0.00 0.0
2004 29.3 15.5 0.00 0.0
2003 22.9 15.9 0.00 0.0
2002 29.2 14.7 0.04 0.0
2001 30.0 17.6 0.04 0.0
2000 19.9 13.7 0.94 0.0
1999 28.2 13.3 0.00 0.0
1998 31.5 15.5 0.00 0.0
1997 24.7 15.7 0.00 0.0
1996 26.2 14.4 0.00 0.0
1995 26.7 16.0 0.00 0.0
1994 31.2 21.7 0.52 0.0
1993 23.4 13.5 0.00 0.0
1992 18.2 7.7 0.00 0.0
1991 27.6 18.8 0.02 0.0
1990 27.6 14.8 0.36 0.0
1989 27.8 11.7 0.00 0.0
1988 26.0 17.8 0.00 0.0
1987 29.4 18.7 0.00 0.0
1986 22.3 12.6 0.00 0.0
1985 28.5 13.2 0.00 0.0
1984 28.4 14.9 0.00 0.0
1983 23.0 18.0 0.94 0.0
1982 27.0 12.0 0.00 0.0
1981 22.0 19.5 0.00 0.0
1980 23.5 16.5 0.14 0.0
1979 30.5 14.5 0.00 0.0
1978 27.5 21.5 0.00 0.0
1977 28.5 24.0 0.00 0.0
1976 23.9 16.1 0.00 0.0
1975 25.6 18.3 0.10 0.0
1974 25.0 13.3 0.00 0.0
1973 26.7 15.6 0.00 0.0
1972 30.0 21.7 0.00 0.0
1971 26.1 11.7 0.00 0.0
1970 16.7 13.3 0.00 0.0
1969 25.6 13.9 0.00 0.0
1968 27.2 16.7 0.00 0.0
1967 29.4 17.2 0.00 0.0
1966 21.1 12.2 0.58 0.0
1965 25.6 12.2 0.00 0.0
1964 30.6 17.2 1.32 0.0
1963 27.8 15.6 0.00 0.0
1962 23.3 16.1 0.30 0.0
1961 26.7 19.4 1.75 0.0
1960 25.0 12.2 0.89 0.0
1959 28.9 15.6 0.00 0.0
1958 25.0 8.3 0.00 0.0
1957 21.7 17.8 0.58 0.0
1956 18.3 16.1 0.48 0.0
1955 36.1 17.8 0.00 0.0
1954 27.2 16.7 0.00 0.0
1953 31.1 20.0 0.03 0.0
1952 23.3 18.3 0.13 0.0
1951 23.9 10.6 0.08 0.0
1950 23.9 7.2 0.00 0.0
1949 25.0 11.7 0.00 0.0
1948 26.7 13.3 0.00 0.0
1947 22.8 11.7 0.38 0.0
1946 26.7 16.7 0.05 0.0
1945 26.7 15.6 0.00 0.0
1944 21.7 12.2 0.05 0.0
1943 27.8 12.8 1.09 0.0
1942 28.3 17.8 0.00 0.0
1941 26.7 11.1 0.00 0.0
1940 29.4 19.4 0.00 0.0
1939 26.7 9.4 0.00 0.0
1938 24.4 13.9 0.00 0.0
1937 30.0 12.2 0.00 0.0
1936 25.0 7.2 0.00 0.0
1935 31.7 18.9 0.15 0.0
1934 29.4 13.9 0.00 0.0
1933 30.6 16.7 0.89 0.0
1932 31.1 9.4 0.00 0.0
1931 28.3 18.3 0.00 0.0
1930 22.2 15.6 0.71 0.0
1929 27.8 7.2 0.00 0.0
1928 25.0 10.0 0.00 0.0
1927 25.0 7.8 0.00 0.0
1926 30.0 22.8 0.00 0.0
1925 27.2 16.7 0.56 0.0
1924 31.1 18.3 0.00 0.0
1923 29.4 16.7 0.38 0.0
1922 31.7 13.3 0.00 0.0
1921 28.3 15.0 0.00 0.0
1920 22.8 15.0 0.13 0.0
1919 28.3 16.7 0.33 0.0
1918 33.3 17.2 0.13 0.0
1917 29.4 17.8 0.38 0.0
1916 30.0 20.6 0.00 0.0
1915 25.6 10.6 0.00 0.0
1914 24.4 15.6 0.08 0.0
1913 27.2 12.8 0.00 0.0
1912 17.8 11.1 0.18 0.0
1911 27.2 11.1 0.20 0.0
1910 23.3 15.6 0.43 0.0
1909 26.7 10.6 0.00 0.0
1908 22.2 15.6 1.42 0.0
1907 28.3 12.2 0.00 0.0
1906 30.0 18.9 0.00 0.0
1905 23.9 8.9 0.00 0.0
1904 23.9 11.1 0.00 0.0
1903 23.3 16.1 0.38 0.0
1902 20.0 13.9 1.50 0.0
1901 32.8 19.4 0.10 0.0
1900 25.6 20.0 0.05 0.0
1899 23.3 13.3 3.23 0.0
1898 28.3 20.6 0.20 0.0
1897 30.6 17.2 0.00 0.0
1896 27.2 17.8 0.00 0.0
1895 27.2 16.1 0.00 0.0
1894 22.2 13.9 0.00 0.0
1893 28.3 15.0 0.00 0.0
1892 28.9 10.6 0.00 0.0
1891 22.8 11.1 0.00 0.0
1890 22.8 10.6 0.00 0.0
What's the all-time high for Ottawa on 7/21?
For the date of Jul 21, the highest temperature ever reached in Ottawa history is 36.3 °C which happened in 2011.
Highest Temperatures in Ottawa on July 21
Rank Temperature Year
1 36.3 °C 2011
2 36.1 °C 1955
3 33.3 °C 1918
4 32.8 °C 1901
5 31.7 °C 1935
5 31.7 °C 1922
7 31.5 °C 1998
7 31.5 °C 2018
7 31.5 °C 2005
7 31.5 °C 2016
What's the all-time low for Ottawa on 7/21?
For the date of Jul 21, the lowest temperature ever reached in Ottawa history is 7.2 °C which has happened 3 times, most recently in 1950.
Lowest Temperatures in Ottawa on July 21
Rank Temperature Year
1 7.2 °C 1950
1 7.2 °C 1929
1 7.2 °C 1936
4 7.7 °C 1992
5 7.8 °C 1927
6 8.3 °C 1958
7 8.9 °C 1905
8 9.4 °C 1939
8 9.4 °C 1932
10 10.0 °C 1928
Lowest High Temperatures in Ottawa on July 21
Rank Temperature Year
1 16.7 °C 1970
2 17.8 °C 1912
3 18.2 °C 1992
4 18.3 °C 1956
5 19.9 °C 2000
6 20.0 °C 1902
7 21.1 °C 1966
8 21.7 °C 1944
8 21.7 °C 1957
10 22.0 °C 1981
What's the most it has ever rained in Ottawa on 7/21?
For the date of Jul 21, the most precipitation ever recorded in Ottawa history is 3.23 cm which happened in 1899.
All-Time Most Precipitation in Ottawa on July 21
Rank Precipitation Year
1 3.23 cm 1899
2 1.75 cm 1961
3 1.50 cm 1902
4 1.42 cm 1908
5 1.32 cm 1964
6 1.09 cm 1943
7 0.94 cm 2000
7 0.94 cm 1983
9 0.92 cm 2023
10 0.89 cm 1960
10 0.89 cm 1933
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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