Lethbridge has a semi-arid climate with an average maximum
temperature of 12.3 °C (54.1 °F) and an average minimum temperature of −1.1 °C
With precipitation averaging 365 mm (14.4 in)–386.3 mm (15.2 in), and 264 dry
days on average, Lethbridge is the eleventh driest city in Canada.
Mean relative humidity hovers between 69–78% in the morning throughout the
year, but afternoon mean relative humidity is more uneven, ranging from 34% in
August to 64% in January.
On average, Lethbridge has 116 days with wind speed of 40 km/h (24.9 mph) or
higher, ranking it as the second city in Canada for such weather.