Ottawa May 18 Weather Records

Daily averages and all-time records for weather in Ottawa, Ontario for the date of May 18.
May 18 All-Time Records
1889–2024
Highest temperature 33.3 °C 1962
Lowest temperature -2.2 °C 1944
Lowest daily high 6.1 °C 1976
Highest daily low 20.0 °C 2017
Most precipitation 2.41 cm 1901
Most snow 0.5 cm 1976
May 18 Average Weather
1991–2020 1
Average high 20.0 °C
Average low 8.7 °C
Chance precipitation 43.2%
Chance snow 0.2%
Ottawa May 18 Weather by Year
Year High (°C) Low (°C) Precip. (cm) Snow (cm)
2023 16.5 -0.5 0.00 0.0
2022 19.0 5.0 0.00 0.0
2021 26.5 13.5 0.00 0.0
2020 n/a n/a n/a n/a
2019 15.5 6.0 0.48 0.0
2018 18.0 5.5 0.00 0.0
2017 30.0 20.0 0.08 0.0
2016 17.0 5.5 0.00 0.0
2015 29.6 10.5 0.16 0.0
2014 15.5 4.5 0.00 0.0
2013 23.0 4.0 0.00 0.0
2012 22.2 3.9 0.00 0.0
2011 17.7 9.0 0.80 0.0
2010 24.9 8.4 0.00 0.0
2009 14.5 2.1 0.00 0.0
2008 17.4 4.1 1.63 0.0
2007 16.5 1.5 0.00 0.0
2006 17.5 11.6 0.97 0.0
2005 14.3 4.5 0.11 0.0
2004 20.8 15.4 0.60 0.0
2003 25.1 7.9 0.00 0.0
2002 7.7 3.5 0.00 0.0
2001 20.4 10.0 1.99 0.0
2000 12.9 9.8 0.73 0.0
1999 27.9 15.3 0.00 0.0
1998 26.0 13.0 0.00 0.0
1997 17.2 3.5 0.04 0.0
1996 26.3 14.5 0.96 0.0
1995 16.8 3.9 0.00 0.0
1994 16.4 4.6 0.18 0.0
1993 17.3 1.0 0.00 0.0
1992 16.1 7.9 0.00 0.0
1991 15.6 4.4 0.00 0.0
1990 15.1 7.8 0.28 0.0
1989 29.9 11.5 0.00 0.0
1988 18.3 7.6 0.00 0.0
1987 15.1 10.4 0.00 0.0
1986 26.9 12.9 1.97 0.0
1985 14.8 4.4 0.00 0.0
1984 17.5 4.2 0.00 0.0
1983 17.0 0.0 0.00 0.0
1982 22.0 10.5 0.00 0.0
1981 13.5 0.5 0.00 0.0
1980 14.5 10.0 1.90 0.0
1979 23.5 5.5 0.00 0.0
1978 20.5 10.0 0.00 0.0
1977 24.5 18.5 0.00 0.0
1976 6.1 3.3 2.16 0.5
1975 26.1 11.1 0.00 0.0
1974 17.2 8.3 0.00 0.0
1973 8.9 5.6 2.26 0.0
1972 23.9 8.3 0.00 0.0
1971 26.1 9.4 0.00 0.0
1970 19.4 4.4 0.00 0.0
1969 16.7 6.1 2.08 0.0
1968 13.9 8.9 0.38 0.0
1967 13.3 0.6 1.55 0.0
1966 17.2 7.8 0.97 0.0
1965 15.0 10.0 0.00 0.0
1964 20.6 8.3 0.43 0.0
1963 15.0 12.2 1.04 0.0
1962 33.3 18.9 0.00 0.0
1961 15.0 2.8 0.58 0.0
1960 26.1 15.0 0.00 0.0
1959 15.6 1.1 0.00 0.0
1958 24.4 9.4 0.13 0.0
1957 16.1 1.7 0.00 0.0
1956 14.4 0.0 0.30 0.0
1955 22.8 7.2 0.10 0.0
1954 14.4 5.0 0.00 0.0
1953 17.8 11.7 0.43 0.0
1952 17.8 3.3 0.00 0.0
1951 20.6 4.4 0.00 0.0
1950 16.1 10.0 0.33 0.0
1949 27.2 13.3 0.08 0.0
1948 12.2 11.1 0.13 0.0
1947 12.8 7.2 1.45 0.0
1946 13.3 7.8 2.16 0.0
1945 9.4 8.3 0.56 0.0
1944 11.1 -2.2 0.00 0.0
1943 16.1 6.7 0.05 0.0
1942 20.0 4.4 0.00 0.0
1941 18.9 2.2 0.00 0.0
1940 14.4 6.7 0.00 0.0
1939 12.2 -1.1 0.00 0.0
1938 21.1 5.6 0.00 0.0
1937 17.2 6.1 0.91 0.0
1936 24.4 15.0 0.13 0.0
1935 14.4 3.3 0.00 0.0
1934 16.1 6.1 0.00 0.0
1933 26.7 8.3 0.66 0.0
1932 16.7 1.7 0.00 0.0
1931 22.2 -1.1 0.00 0.0
1930 13.3 -1.1 0.00 0.0
1929 18.3 7.8 0.00 0.0
1928 20.0 12.2 0.10 0.0
1927 16.1 7.2 1.27 0.0
1926 23.3 11.1 0.00 0.0
1925 14.4 -1.1 0.00 0.0
1924 18.3 12.8 0.33 0.0
1923 18.3 4.4 0.20 0.0
1922 20.6 11.1 0.33 0.0
1921 17.8 8.9 0.03 0.0
1920 24.4 11.1 0.00 0.0
1919 13.9 6.7 0.25 0.0
1918 29.4 11.7 0.00 0.0
1917 17.8 3.9 0.00 0.0
1916 9.4 4.4 1.37 0.0
1915 14.4 3.9 0.20 0.0
1914 28.3 6.7 0.00 0.0
1913 19.4 11.1 0.38 0.0
1912 21.1 4.4 0.25 0.0
1911 30.0 12.8 0.00 0.0
1910 15.6 9.4 0.25 0.0
1909 17.8 7.8 0.00 0.0
1908 26.1 8.9 0.00 0.0
1907 18.9 7.2 0.25 0.0
1906 32.2 11.7 0.38 0.0
1905 17.8 9.4 0.23 0.0
1904 22.2 6.1 0.00 0.0
1903 30.6 13.3 0.08 0.0
1902 24.4 6.1 0.00 0.0
1901 12.8 10.0 2.41 0.0
1900 12.2 4.4 0.89 0.0
1899 n/a n/a n/a n/a
1898 22.8 3.3 0.00 0.0
1897 22.2 7.8 0.00 0.0
1896 20.6 12.8 0.20 0.0
1895 19.4 1.7 0.25 0.0
1894 16.1 9.4 0.23 0.0
1893 11.1 6.7 2.06 0.0
1892 23.9 6.7 0.00 0.0
1891 10.0 5.0 0.00 0.0
1890 12.2 2.2 0.05 0.0
What's the all-time high for Ottawa on 5/18?
For the date of May 18, the highest temperature ever reached in Ottawa history is 33.3 °C which happened in 1962.
Highest Temperatures in Ottawa on May 18
Rank Temperature Year
1 33.3 °C 1962
2 32.2 °C 1906
3 30.6 °C 1903
4 30.0 °C 1911
4 30.0 °C 2017
6 29.9 °C 1989
7 29.6 °C 2015
8 29.4 °C 1918
9 28.3 °C 1914
10 27.9 °C 1999
What's the all-time low for Ottawa on 5/18?
For the date of May 18, the lowest temperature ever reached in Ottawa history is -2.2 °C which happened in 1944.
Lowest Temperatures in Ottawa on May 18
Rank Temperature Year
1 -2.2 °C 1944
2 -1.1 °C 1939
2 -1.1 °C 1931
2 -1.1 °C 1925
2 -1.1 °C 1930
6 -0.5 °C 2023
7 0.0 °C 1983
7 0.0 °C 1956
9 0.5 °C 1981
10 0.6 °C 1967
Lowest High Temperatures in Ottawa on May 18
Rank Temperature Year
1 6.1 °C 1976
2 7.7 °C 2002
3 8.9 °C 1973
4 9.4 °C 1916
4 9.4 °C 1945
6 10.0 °C 1891
7 11.1 °C 1944
7 11.1 °C 1893
9 12.2 °C 1890
9 12.2 °C 1939
9 12.2 °C 1948
9 12.2 °C 1900
What's the most it has ever rained in Ottawa on 5/18?
For the date of May 18, the most precipitation ever recorded in Ottawa history is 2.41 cm which happened in 1901.
All-Time Most Precipitation in Ottawa on May 18
Rank Precipitation Year
1 2.41 cm 1901
2 2.26 cm 1973
3 2.16 cm 1946
3 2.16 cm 1976
5 2.08 cm 1969
6 2.06 cm 1893
7 1.99 cm 2001
8 1.97 cm 1986
9 1.90 cm 1980
10 1.63 cm 2008
All-Time Most Snow in Ottawa on May 18
Rank Precipitation Year
1 0.5 cm 1976
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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