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Lethbridge, Alberta climate
BSk Cold semi-arid
Lethbridge has a seasonal cold-temperate climate (Cold semi-arid, Köppen BSk). The hottest month is July with an average daily high near 27°C, while the coldest is January averaging around −11°C at night. Precipitation totals about 284 mm a year and is strongly seasonal — June alone averages 84 mm while January barely receives 6 mm. Snow is occasional (6 cm of snow per year on average).
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 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)Lethbridge climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 0 | 2 | 6 | 12 | 18 | 22 | 27 | 26 | 21 | 13 | 6 | 1 |
| Avg temp (°C) | −5 | −4 | 0 | 6 | 11 | 15 | 19 | 18 | 14 | 7 | 0 | −5 |
| Avg low (°C) | −11 | −10 | −6 | −1 | 5 | 9 | 12 | 10 | 6 | 0 | −6 | −10 |
| Precipitation (mm) | 6 | — | 9 | 22 | 48 | 84 | 33 | 28 | 30 | 17 | 7 | — |
| Snowfall (cm) | — | — | — | — | 6 | — | — | — | — | — | — | — |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 0 | 2 | 6 | 12 | 18 | 22 |
| Avg temp (°C) | −5 | −4 | 0 | 6 | 11 | 15 |
| Avg low (°C) | −11 | −10 | −6 | −1 | 5 | 9 |
| Precipitation (mm) | 6 | — | 9 | 22 | 48 | 84 |
| Snowfall (cm) | — | — | — | — | 6 | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 27 | 26 | 21 | 13 | 6 | 1 |
| Avg temp (°C) | 19 | 18 | 14 | 7 | 0 | −5 |
| Avg low (°C) | 12 | 10 | 6 | 0 | −6 | −10 |
| Precipitation (mm) | 33 | 28 | 30 | 17 | 7 | — |
| Snowfall (cm) | — | — | — | — | — | — |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 72 | 69 | 69 | 69 | 67 | 64 | 47 | 54 | 58 | 66 | 70 | 68 |
| Relative humidity (%) | 82 | 76 | 69 | 61 | 58 | 59 | 52 | 51 | 57 | 65 | 74 | 79 |
| Wind speed (mph) | 8.9 | 8.6 | 8.8 | 8.3 | 7.3 | 6.9 | 6.1 | 5.7 | 6.4 | 7.8 | 8.8 | 8.9 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 72 | 69 | 69 | 69 | 67 | 64 |
| Relative humidity (%) | 82 | 76 | 69 | 61 | 58 | 59 |
| Wind speed (mph) | 8.9 | 8.6 | 8.8 | 8.3 | 7.3 | 6.9 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 47 | 54 | 58 | 66 | 70 | 68 |
| Relative humidity (%) | 52 | 51 | 57 | 65 | 74 | 79 |
| Wind speed (mph) | 6.1 | 5.7 | 6.4 | 7.8 | 8.8 | 8.9 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 23 years of daily observations at Lethbridge Cda, a weather station, about 3 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.