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Grimsby, Ontario climate
Dfa Hot-summer humid continental
Grimsby has a strongly seasonal cool-temperate climate (Hot-summer humid continental, Köppen Dfa). The hottest month is July with an average daily high near 27°C, while the coldest is January averaging around −7°C at night. Precipitation is fairly even year-round, totalling about 900 mm. Winters bring significant snowfall (135 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)Grimsby climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 0 | 1 | 6 | 13 | 19 | 25 | 27 | 27 | 23 | 15 | 9 | 3 |
| Avg temp (°C) | −3 | −2 | 2 | 8 | 14 | 20 | 23 | 22 | 18 | 11 | 6 | 0 |
| Avg low (°C) | −7 | −6 | −2 | 3 | 9 | 15 | 18 | 17 | 14 | 8 | 2 | −3 |
| Precipitation (mm) | 84 | 55 | 65 | 80 | 79 | 84 | 76 | 65 | 82 | 81 | 76 | 73 |
| Snowfall (cm) | 43 | 28 | 22 | 6 | — | — | — | — | — | 0 | 7 | 27 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 0 | 1 | 6 | 13 | 19 | 25 |
| Avg temp (°C) | −3 | −2 | 2 | 8 | 14 | 20 |
| Avg low (°C) | −7 | −6 | −2 | 3 | 9 | 15 |
| Precipitation (mm) | 84 | 55 | 65 | 80 | 79 | 84 |
| Snowfall (cm) | 43 | 28 | 22 | 6 | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 27 | 27 | 23 | 15 | 9 | 3 |
| Avg temp (°C) | 23 | 22 | 18 | 11 | 6 | 0 |
| Avg low (°C) | 18 | 17 | 14 | 8 | 2 | −3 |
| Precipitation (mm) | 76 | 65 | 82 | 81 | 76 | 73 |
| Snowfall (cm) | — | — | — | 0 | 7 | 27 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 78 | 74 | 73 | 73 | 72 | 67 | 63 | 62 | 62 | 72 | 75 | 77 |
| Relative humidity (%) | 86 | 84 | 81 | 78 | 76 | 74 | 71 | 71 | 73 | 77 | 81 | 85 |
| Wind speed (mph) | 11.5 | 10.7 | 9.0 | 7.8 | 6.2 | 5.9 | 6.1 | 6.1 | 6.9 | 8.4 | 9.4 | 10.4 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 78 | 74 | 73 | 73 | 72 | 67 |
| Relative humidity (%) | 86 | 84 | 81 | 78 | 76 | 74 |
| Wind speed (mph) | 11.5 | 10.7 | 9.0 | 7.8 | 6.2 | 5.9 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 63 | 62 | 62 | 72 | 75 | 77 |
| Relative humidity (%) | 71 | 71 | 73 | 77 | 81 | 85 |
| Wind speed (mph) | 6.1 | 6.1 | 6.9 | 8.4 | 9.4 | 10.4 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 20 years of daily observations at Vineland, 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.