Ottawa - Extreme Daily Precipitation for Each Year





This page lists the biggest rainstorms or snowstorms of the year in Ottawa, Ontario Canada along with the date they occurred. The information answers questions like: When was the last time more than 100 millimetres of precipitation landed on Ottawa in a single day? What was the rainiest day of 2017?

The list gives the highest daily precipitation for each year in Ottawa and the date that it happened. A date with a plus sign beside it means the same amount of moisture also fell on at least one other day earlier that year.

These records were observed near downtown Ottawa and go back to 1890. During that time the heaviest downpour measured for a single day was 108.7 millimetres (4.3 inches) on September 9, 2004.

Most precipitation in one day for recent years in Ottawa
Inches Date Milli­metres
2.8 October 29, 2017 70.4
2.7 August 13, 2016 68.1
1.6 September 12, 2015 39.9
2.7 June 24, 2014 69.3
1.5 February 27, 2013 38.1
1.2 September 08, 2012 30.0
1.7 April 10, 2011 43.7
1.7 August 15, 2010 43.7
Highest daily precipitation recorded at Ottawa each year
Inches Date Milli­metres
1.9 July 24, 2009 49.0
1.7 October 25, 2008 42.4
1.7 July 19, 2007 42.4
2.3 August 02, 2006 58.4
1.9 April 02, 2005 47.5
4.3 September 09, 2004 108.7
1.9 May 24, 2003 48.3
2.3 June 11, 2002 58.9
1.7 September 24, 2001 42.4
1.9 August 01, 2000 49.3
1.3 November 02, 1999 33.3
1.5 September 26, 1998 37.1
1.5 February 21, 1997 38.4
2.9 August 08, 1996 74.7
2.3 October 05, 1995 58.4
1.7 August 04, 1994 42.9
1.9 November 27, 1993 47.5
1.5 August 28, 1992 38.1
1.3 October 15, 1991 32.8
1.3 August 28, 1990 32.0
2.3 September 01, 1989 59.4
3.2 August 04, 1988 82.0
1.9 September 12, 1987 48.5
3.3 September 11, 1986 83.3
1.4 June 17, 1985 34.8
1.3 April 16, 1984 33.5
1.3 June 17, 1983 33.8
1.1 April 20, 1982 28.7
2.0 August 04, 1981 51.3
2.0 October 25, 1980 51.6
1.6 November 26, 1979 39.4
1.3 June 12, 1978 34.0
1.7 May 23, 1977 43.7
1.4 October 09, 1976 35.6
1.2 September 25, 1975 30.2
1.6 March 04, 1974 40.6
2.4 August 08, 1973 60.5
2.0 August 07, 1972 50.5
2.8 June 07, 1971 71.1
1.6 July 20, 1970 41.1
2.0 August 18, 1969 51.1
1.4 September 05, 1968 35.8
1.9 September 21, 1967 48.3
1.2 August 16, 1966 30.5
1.4 August 06, 1965 36.1
1.2 July 12, 1964 30.5
2.2 September 12, 1963 54.9
1.9 March 12, 1962 48.8
1.2 February 25, 1961 29.5
1.8 February 19, 1960 45.2
1.8 July 01, 1959 44.5
1.7 July 28, 1958 43.4
1.7 June 23, 1957 42.7
1.9 April 15, 1956 48.3
1.9 October 15, 1955 48.3
1.6 September 29, 1954 41.1
1.5 August 04, 1953 38.9
2.4 July 09, 1952 61.0
1951
2.7 July 17, 1950 68.1
1.2 September 13, 1949 30.2
1.4 November 19, 1948 36.3
2.0 July 17, 1947 50.3
3.1 June 17, 1946 77.5
2.4 September 18, 1945 60.5
1.2 April 24, 1944 30.0
3.6 August 23, 1943 90.4
3.7 September 09, 1942 93.2
1.6 October 04, 1941 40.6
1.3 May 25, 1940 34.0
2.1 July 29, 1939 52.3
2.8 July 22, 1938 71.6
1.5 August 19, 1937 37.8
1.1 August 14, 1936 + 27.9
1.8 June 14, 1935 46.5
1.5 April 11, 1934 38.6
2.9 December 31, 1933 73.2
1.8 October 06, 1932 45.0
1.1 June 07, 1931 28.4
1.4 July 14, 1930 34.5
1.5 July 28, 1929 38.1
1.9 June 29, 1928 48.3
1.7 July 23, 1927 41.9
2.0 July 09, 1926 49.5
1925
1.4 September 30, 1924 34.8
1.7 October 24, 1923 43.9
1.6 June 17, 1922 40.1
1.9 May 31, 1921 47.5
1.1 August 10, 1920 26.9
1.8 October 31, 1919 46.0
2.3 September 05, 1918 58.7
1.2 August 16, 1917 29.5
3.0 May 17, 1916 75.9
1.8 August 22, 1915 46.2
1.2 November 16, 1914 30.0
1.7 August 22, 1913 43.2
2.1 November 25, 1912 53.3
1.5 June 12, 1911 37.6
1.5 October 06, 1910 37.3
1.4 March 25, 1909 36.1
1.4 May 01, 1908 36.3
1.9 November 07, 1907 49.0
1.6 September 29, 1906 39.6
1.9 June 13, 1905 49.3
1.7 August 20, 1904 42.7
2.0 June 12, 1903 51.6
2.1 January 22, 1902 53.1
1.6 December 15, 1901 39.4
2.3 July 17, 1900 59.4
1899
1.1 October 22, 1898 28.4
1.1 July 12, 1897 28.4
2.0 June 09, 1896 50.0
2.3 June 27, 1895 57.7
2.2 January 29, 1894 55.9
2.0 August 29, 1893 50.0
2.0 June 19, 1892 49.8
2.1 July 14, 1891 53.8
1.7 August 21, 1890 42.9
Reference

Environment and Climate Change Canada. Historical Climate Data. Historical Data

Jay Lawrimore. 2016. Global Summary of the Year, Version 1.0. NOAA National Centers for Environmental Information. 

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