Summers are brief and cool and winters are mild and snowy, with frequent warm spells caused by chinooks. Wind is the most important climate factor in the park. After the Crowsnest Pass, Waterton is the second windiest, warmest places in Alberta. Prevailing winds are from the southwest.
Temperatures can rise dramatically in short periods of time.
Waterton receives Alberta's highest average annual precipitation levels - 1,072 mm. The more influential Pacific system gives Waterton high precipitation and frequent chinook winds. It's a strong wind that becomes warm and very dry while rapidly descending the lee side of mountain slopes. The wind turbulence is similar to the action river water makes when it hits a rock. As the air flows down, waves are created.