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Brockville, Ontario climate
Dfb Warm-summer humid continental
Brockville has a strongly seasonal cool-temperate climate (Warm-summer humid continental, Köppen Dfb). The hottest month is July with an average daily high near 26°C, while the coldest is January averaging around −11°C at night. Precipitation is fairly even year-round, totalling about 1013 mm. Snowfall is heavy (179 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)Brockville climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | −3 | −2 | 4 | 11 | 19 | 23 | 26 | 25 | 21 | 14 | 7 | 0 |
| Avg temp (°C) | −7 | −6 | −1 | 7 | 14 | 18 | 21 | 21 | 16 | 10 | 3 | −3 |
| Avg low (°C) | −11 | −10 | −5 | 2 | 8 | 14 | 16 | 16 | 12 | 6 | 0 | −7 |
| Precipitation (mm) | 84 | 63 | 68 | 89 | 84 | 95 | 92 | 82 | 93 | 100 | 81 | 83 |
| Snowfall (cm) | 50 | 41 | 29 | 8 | 0 | — | — | — | — | 1 | 11 | 40 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | −3 | −2 | 4 | 11 | 19 | 23 |
| Avg temp (°C) | −7 | −6 | −1 | 7 | 14 | 18 |
| Avg low (°C) | −11 | −10 | −5 | 2 | 8 | 14 |
| Precipitation (mm) | 84 | 63 | 68 | 89 | 84 | 95 |
| Snowfall (cm) | 50 | 41 | 29 | 8 | 0 | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 26 | 25 | 21 | 14 | 7 | 0 |
| Avg temp (°C) | 21 | 21 | 16 | 10 | 3 | −3 |
| Avg low (°C) | 16 | 16 | 12 | 6 | 0 | −7 |
| Precipitation (mm) | 92 | 82 | 93 | 100 | 81 | 83 |
| Snowfall (cm) | — | — | — | 1 | 11 | 40 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 76 | 71 | 67 | 68 | 66 | 63 | 57 | 57 | 57 | 70 | 74 | 77 |
| Relative humidity (%) | 91 | 90 | 83 | 77 | 77 | 78 | 76 | 74 | 74 | 78 | 83 | 88 |
| Wind speed (km/h) | 4.6 | 5.6 | 4.3 | 2.3 | 1.2 | 1.2 | 1.1 | 1.2 | 1.2 | 1.3 | 1.5 | 2.6 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 76 | 71 | 67 | 68 | 66 | 63 |
| Relative humidity (%) | 91 | 90 | 83 | 77 | 77 | 78 |
| Wind speed (km/h) | 4.6 | 5.6 | 4.3 | 2.3 | 1.2 | 1.2 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 57 | 57 | 57 | 70 | 74 | 77 |
| Relative humidity (%) | 76 | 74 | 74 | 78 | 83 | 88 |
| Wind speed (km/h) | 1.1 | 1.2 | 1.2 | 1.3 | 1.5 | 2.6 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 30 years of daily observations at Brockville Pcc, a weather station, about 2 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.