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 2019?
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.
| Inches | Date | Millimetres |
|---|---|---|
| 2.3 | June 26, 2023 | 58.0 |
| 2.1 | August 07, 2022 | 54.4 |
| 1.7 | October 15, 2021 | 41.9 |
| 1.4 | August 02, 2020 | 36.1 |
| 1.4 | April 14, 2019 | 35.1 |
| 3.3 | July 24, 2018 | 84.6 |
| 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 |
| 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.