| Month | Average (°C) | Record (°C) | Average (cm) | |||
|---|---|---|---|---|---|---|
| High ☀️ | Low 🌙 | High ☀️ | Low 🌙 | Precipitation 💧 | Snow ❄️ | |
| January | -5.2 | -13.7 | 12.0 | -37.8 | 6.5 | 43.8 |
| February | -3.5 | -12.8 | 16.0 | -38.3 | 5.1 | 39.9 |
| March | 2.6 | -6.7 | 26.7 | -36.7 | 6.1 | 30.6 |
| April | 11.3 | 1.3 | 31.2 | -20.6 | 8.0 | 7.7 |
| May | 19.6 | 8.3 | 35.2 | -7.2 | 8.0 | 0.0 |
| June | 24.4 | 13.6 | 36.7 | 0.0 | 9.5 | 0.0 |
| July | 26.8 | 16.0 | 37.8 | 3.3 | 9.2 | 0.0 |
| August | 25.7 | 14.8 | 37.8 | 1.7 | 8.7 | 0.0 |
| September | 21.3 | 10.5 | 36.7 | -4.4 | 8.7 | 0.0 |
| October | 13.4 | 4.5 | 31.0 | -12.8 | 8.9 | 2.0 |
| November | 5.9 | -1.5 | 24.0 | -23.9 | 7.0 | 16.2 |
| December | -1.6 | -8.5 | 17.2 | -38.9 | 7.2 | 42.4 |
| Entire year | 11.8 | 2.2 | 37.8 | -38.9 | 92.7 | 181.8 |
|
More Ottawa Weather Records
1889–2024
|
||
|---|---|---|
| Highest daily low | 24.8 °C | August 9, 2001 |
| Lowest daily high | -31.7 °C | December 29, 1933 |
| Greatest daily range (Difference of high and low) |
35.6 °C | March 4, 1950 |
| Greatest difference in daily high over two conscutive days |
26.7 °C | Jan 28–29, 1934 |
| Most daily precipitation | 10.9 cm | September 9, 2004 |
| Most monthly precipitation | 25.0 cm | July 1899 |
| Most yearly precipitation | 118.3 cm | 2017 |
| Most yearly days with precipitation | 187 | 1980 |
| Earliest snow in season | October 8 | 1979 |
| Latest snow in season | May 26 | 1994 |
| Most daily snow | 55.9 cm | January 29, 1894 |
| Most monthly snow | 137.8 cm | February 1971 |
| Most yearly snow | 356.9 cm | 1971 |
| Most snow in a winter | 387.8 cm | 1970–1971 |
| Greatest snow accumulation | 97.0 cm | February 25, 1971 |
| Earliest freeze | September 13 | 1946 |
| Earliest day ≥ 20 °C | March 18 | 2012 |
| Earliest day ≥ 25 °C | March 20 | 2012 |
| Earliest day ≥ 30 °C | April 17 | 2002 |
| Earliest day ≥ 35 °C | May 21 | 1921 |
| Latest freeze | May 29 | 1907 |
| Latest day ≥ 20 °C | November 12 | 2012 |
| Latest day ≥ 25 °C | October 24 | 1963 |
| Latest day ≥ 30 °C | October 4 | 2023 |
| Latest day ≥ 35 °C | September 11 | 1931 |
| Most days in a year < 0 °C | 184 | 1907 |
| Most days in a year ≥ 20 °C | 144 | 2023 |
| Most days in a year ≥ 25 °C | 97 | 1959 |
| Most days in a year ≥ 30 °C | 42 | 1955 |
| Most days in a year ≥ 35 °C | 10 | 1916 |
|
Ottawa Weather Streaks
Most consecutive days...
|
||
|---|---|---|
| With precipitation | 16 days | Sep 23 – Oct 8, 1991 |
| Without precipitation | 25 days | Mar 19 – Apr 12, 1941 |
| With snow | 11 days | Dec 7–17, 1978 |
| Freezing temperatures High temperature ≤ 0 °C |
61 days | Dec 17, 1944 – Feb 15, 1945 |
| High temperature ≥ 20 °C | 104 days | Jun 2 – Sep 13, 1921 |
| High temperature ≥ 25 °C | 45 days | Jun 17 – Jul 31, 1921 |
| High temperature ≥ 30 °C | 12 days | Jul 29 – Aug 9, 1911 |
| High temperature ≥ 35 °C | 4 days | Aug 19–22, 1916 |
| Years | Station | Coordinates |
|---|---|---|
| 1889–2024 | Ottawa CDA | location |