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Ottawa, Ontario climate
Dfb Warm-summer humid continental
Ottawa has a strongly seasonal cold-temperate climate (Warm-summer humid continental, Köppen Dfb). The hottest month is July with an average daily high near 27°C, while the coldest is January averaging around −14°C at night. Precipitation is fairly even year-round, totalling about 931 mm. Snowfall is heavy (185 cm of snow per year on average).
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation split into rain and snow · 1991–2020 normals · hover a month for the exact figuresHours of sunshine per day
Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)Ottawa climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | −5 | −3 | 3 | 11 | 20 | 24 | 27 | 26 | 21 | 13 | 6 | −2 |
| Avg temp (°C) | −9 | −8 | −2 | 6 | 14 | 19 | 21 | 20 | 16 | 9 | 2 | −5 |
| Avg low (°C) | −14 | −13 | −7 | 1 | 8 | 14 | 16 | 15 | 11 | 4 | −2 | −8 |
| Precipitation (mm) | 65 | 52 | 62 | 80 | 80 | 95 | 92 | 87 | 87 | 89 | 70 | 72 |
| Snowfall (cm) | 44 | 41 | 31 | 8 | 0 | — | — | — | — | 2 | 16 | 43 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | −5 | −3 | 3 | 11 | 20 | 24 |
| Avg temp (°C) | −9 | −8 | −2 | 6 | 14 | 19 |
| Avg low (°C) | −14 | −13 | −7 | 1 | 8 | 14 |
| Precipitation (mm) | 65 | 52 | 62 | 80 | 80 | 95 |
| Snowfall (cm) | 44 | 41 | 31 | 8 | 0 | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 27 | 26 | 21 | 13 | 6 | −2 |
| Avg temp (°C) | 21 | 20 | 16 | 9 | 2 | −5 |
| Avg low (°C) | 16 | 15 | 11 | 4 | −2 | −8 |
| Precipitation (mm) | 92 | 87 | 87 | 89 | 70 | 72 |
| Snowfall (cm) | — | — | — | 2 | 16 | 43 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 69 | 64 | 63 | 66 | 66 | 63 | 58 | 58 | 58 | 69 | 72 | 73 |
| Relative humidity (%) | 95 | 95 | 88 | 78 | 77 | 78 | 79 | 78 | 78 | 80 | 85 | 92 |
| Wind speed (km/h) | 4.4 | 5.6 | 4.6 | 2.6 | 1.2 | 1.0 | 1.0 | 1.0 | 1.1 | 1.1 | 1.3 | 2.4 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 69 | 64 | 63 | 66 | 66 | 63 |
| Relative humidity (%) | 95 | 95 | 88 | 78 | 77 | 78 |
| Wind speed (km/h) | 4.4 | 5.6 | 4.6 | 2.6 | 1.2 | 1.0 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 58 | 58 | 58 | 69 | 72 | 73 |
| Relative humidity (%) | 79 | 78 | 78 | 80 | 85 | 92 |
| Wind speed (km/h) | 1.0 | 1.0 | 1.1 | 1.1 | 1.3 | 2.4 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 30 years of daily observations at Ottawa Cda, a weather station, about 4 km from the city centre. The underlying daily records come from NOAA's global station network.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.