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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 80°F, while the coldest is January averaging around 12°F at night. Precipitation totals about 11 inches a year and is strongly seasonal — June alone averages 3.3 inches while January barely receives 0.25 inches. Snow is occasional (2 inches 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 (°F) | 33 | 36 | 43 | 54 | 64 | 71 | 80 | 79 | 70 | 56 | 42 | 34 |
| Avg temp (°F) | 22 | 25 | 32 | 42 | 52 | 60 | 66 | 65 | 57 | 44 | 32 | 24 |
| Avg low (°F) | 12 | 14 | 20 | 31 | 40 | 48 | 53 | 51 | 43 | 33 | 22 | 14 |
| Precipitation (in) | 0.3 | — | 0.4 | 0.8 | 1.9 | 3.3 | 1.3 | 1.1 | 1.2 | 0.7 | 0.3 | — |
| Snowfall (in) | — | — | — | — | 2.2 | — | — | — | — | — | — | — |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 33 | 36 | 43 | 54 | 64 | 71 |
| Avg temp (°F) | 22 | 25 | 32 | 42 | 52 | 60 |
| Avg low (°F) | 12 | 14 | 20 | 31 | 40 | 48 |
| Precipitation (in) | 0.3 | — | 0.4 | 0.8 | 1.9 | 3.3 |
| Snowfall (in) | — | — | — | — | 2.2 | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 80 | 79 | 70 | 56 | 42 | 34 |
| Avg temp (°F) | 66 | 65 | 57 | 44 | 32 | 24 |
| Avg low (°F) | 53 | 51 | 43 | 33 | 22 | 14 |
| Precipitation (in) | 1.3 | 1.1 | 1.2 | 0.7 | 0.3 | — |
| Snowfall (in) | — | — | — | — | — | — |
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.