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London, Ontario climate
Dfb Warm-summer humid continental
London has a strongly seasonal cool-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 −8°C at night. Precipitation is fairly even year-round, totalling about 908 mm. Winters bring significant snowfall (113 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)London climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 0 | 1 | 6 | 13 | 20 | 25 | 27 | 26 | 22 | 16 | 8 | 3 |
| Avg temp (°C) | −4 | −4 | 1 | 7 | 14 | 19 | 21 | 21 | 17 | 11 | 4 | −1 |
| Avg low (°C) | −8 | −8 | −3 | 2 | 8 | 13 | 16 | 15 | 11 | 6 | 0 | −4 |
| Precipitation (mm) | 83 | 60 | 63 | 85 | 80 | 79 | 77 | 66 | 83 | 89 | 77 | 65 |
| Snowfall (cm) | 38 | 27 | 16 | 3 | — | — | — | — | — | 0 | 8 | 21 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 0 | 1 | 6 | 13 | 20 | 25 |
| Avg temp (°C) | −4 | −4 | 1 | 7 | 14 | 19 |
| Avg low (°C) | −8 | −8 | −3 | 2 | 8 | 13 |
| Precipitation (mm) | 83 | 60 | 63 | 85 | 80 | 79 |
| Snowfall (cm) | 38 | 27 | 16 | 3 | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 27 | 26 | 22 | 16 | 8 | 3 |
| Avg temp (°C) | 21 | 21 | 17 | 11 | 4 | −1 |
| Avg low (°C) | 16 | 15 | 11 | 6 | 0 | −4 |
| Precipitation (mm) | 77 | 66 | 83 | 89 | 77 | 65 |
| Snowfall (cm) | — | — | — | 0 | 8 | 21 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 78 | 77 | 75 | 72 | 70 | 64 | 57 | 57 | 58 | 68 | 75 | 79 |
| Relative humidity (%) | 88 | 86 | 81 | 76 | 73 | 70 | 67 | 68 | 71 | 77 | 83 | 87 |
| Wind speed (mph) | 10.5 | 10.1 | 9.4 | 9.0 | 7.4 | 6.5 | 6.1 | 5.9 | 6.6 | 7.8 | 8.7 | 9.4 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 78 | 77 | 75 | 72 | 70 | 64 |
| Relative humidity (%) | 88 | 86 | 81 | 76 | 73 | 70 |
| Wind speed (mph) | 10.5 | 10.1 | 9.4 | 9.0 | 7.4 | 6.5 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 57 | 57 | 58 | 68 | 75 | 79 |
| Relative humidity (%) | 67 | 68 | 71 | 77 | 83 | 87 |
| Wind speed (mph) | 6.1 | 5.9 | 6.6 | 7.8 | 8.7 | 9.4 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 26 years of daily observations at ST Thomas Wpcp, a weather station, about 24 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.