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Bowmanville, Ontario climate
Dfb Warm-summer humid continental
Bowmanville has a strongly seasonal cool-temperate climate (Warm-summer humid continental, Köppen Dfb). The hottest month is July with an average daily high near 25°C, while the coldest is January averaging around −8°C at night. Precipitation is fairly even year-round, totalling about 884 mm. Winters bring significant snowfall (94 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)Bowmanville climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | −1 | 0 | 4 | 11 | 17 | 23 | 25 | 25 | 21 | 14 | 8 | 2 |
| Avg temp (°C) | −4 | −4 | 1 | 7 | 13 | 18 | 21 | 20 | 16 | 10 | 4 | −1 |
| Avg low (°C) | −8 | −8 | −3 | 2 | 8 | 13 | 16 | 16 | 12 | 6 | 1 | −4 |
| Precipitation (mm) | 70 | 52 | 51 | 84 | 82 | 90 | 85 | 73 | 84 | 75 | 73 | 63 |
| Snowfall (cm) | 31 | 25 | 10 | 2 | — | — | — | — | — | 0 | 5 | 20 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | −1 | 0 | 4 | 11 | 17 | 23 |
| Avg temp (°C) | −4 | −4 | 1 | 7 | 13 | 18 |
| Avg low (°C) | −8 | −8 | −3 | 2 | 8 | 13 |
| Precipitation (mm) | 70 | 52 | 51 | 84 | 82 | 90 |
| Snowfall (cm) | 31 | 25 | 10 | 2 | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 25 | 25 | 21 | 14 | 8 | 2 |
| Avg temp (°C) | 21 | 20 | 16 | 10 | 4 | −1 |
| Avg low (°C) | 16 | 16 | 12 | 6 | 1 | −4 |
| Precipitation (mm) | 85 | 73 | 84 | 75 | 73 | 63 |
| Snowfall (cm) | — | — | — | 0 | 5 | 20 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 81 | 76 | 75 | 77 | 79 | 75 | 69 | 66 | 65 | 71 | 77 | 79 |
| Relative humidity (%) | 89 | 88 | 82 | 78 | 75 | 71 | 67 | 68 | 71 | 78 | 83 | 88 |
| Wind speed (mph) | 10.1 | 10.2 | 9.3 | 8.3 | 6.7 | 6.2 | 6.3 | 6.2 | 6.8 | 7.9 | 8.4 | 9.1 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 81 | 76 | 75 | 77 | 79 | 75 |
| Relative humidity (%) | 89 | 88 | 82 | 78 | 75 | 71 |
| Wind speed (mph) | 10.1 | 10.2 | 9.3 | 8.3 | 6.7 | 6.2 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 69 | 66 | 65 | 71 | 77 | 79 |
| Relative humidity (%) | 67 | 68 | 71 | 78 | 83 | 88 |
| Wind speed (mph) | 6.3 | 6.2 | 6.8 | 7.9 | 8.4 | 9.1 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 28 years of daily observations at Oshawa Wpcp, a weather station, about 13 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.