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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 79°F, while the coldest is January averaging around 12°F at night. Precipitation is fairly even year-round, totalling about 40 inches. Snowfall is heavy (71 inches 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 (°F) | 26 | 29 | 39 | 52 | 66 | 74 | 79 | 78 | 70 | 57 | 45 | 33 |
| Avg temp (°F) | 19 | 21 | 31 | 44 | 56 | 65 | 70 | 69 | 62 | 50 | 38 | 27 |
| Avg low (°F) | 12 | 14 | 23 | 35 | 47 | 56 | 62 | 60 | 53 | 42 | 32 | 20 |
| Precipitation (in) | 3.3 | 2.5 | 2.7 | 3.5 | 3.3 | 3.7 | 3.6 | 3.2 | 3.7 | 3.9 | 3.2 | 3.3 |
| Snowfall (in) | 19.6 | 16.3 | 11.2 | 3.0 | 0.1 | — | — | — | — | 0.5 | 4.4 | 15.6 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 26 | 29 | 39 | 52 | 66 | 74 |
| Avg temp (°F) | 19 | 21 | 31 | 44 | 56 | 65 |
| Avg low (°F) | 12 | 14 | 23 | 35 | 47 | 56 |
| Precipitation (in) | 3.3 | 2.5 | 2.7 | 3.5 | 3.3 | 3.7 |
| Snowfall (in) | 19.6 | 16.3 | 11.2 | 3.0 | 0.1 | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 79 | 78 | 70 | 57 | 45 | 33 |
| Avg temp (°F) | 70 | 69 | 62 | 50 | 38 | 27 |
| Avg low (°F) | 62 | 60 | 53 | 42 | 32 | 20 |
| Precipitation (in) | 3.6 | 3.2 | 3.7 | 3.9 | 3.2 | 3.3 |
| Snowfall (in) | — | — | — | 0.5 | 4.4 | 15.6 |
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 (mph) | 2.9 | 3.5 | 2.7 | 1.4 | 0.7 | 0.7 | 0.7 | 0.7 | 0.8 | 0.8 | 0.9 | 1.6 |
| 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 (mph) | 2.9 | 3.5 | 2.7 | 1.4 | 0.7 | 0.7 |
| 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 (mph) | 0.7 | 0.7 | 0.8 | 0.8 | 0.9 | 1.6 |
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.