Climate

Waterton’s climate is defined by three things: moisture, wind, and rapid weather changes. The park sits where warm Pacific air masses meet cold Arctic continental air, creating a unique climate that supports an exceptional mix of plant and animal species. 

That (in)famous wind

As one of the windiest places in Canada, the average daily wind speed is 30 km/h (18 mph).

Wind gusts over 100 km/h (62 mph) are common in fall and winter, with gusts recorded as exceeding 150 km/h (93 mph).

The park's mountain valleys funnel southwest winds, shaping snow distribution, wildlife movement, and local ecosystems.

Chinooks: winter warm winds

In Blackfoot, chinooks are referred to as asi’kssopo (pronounced aaks-SICK-sooh-pooh), meaning "warm wind."

Chinooks occur more frequently here than in most other parts of Alberta. Waterton is one of Alberta's warmest winter locations despite occasional lows of -40°C (-40°F).

Waterton sits at a narrow gap in the Rocky Mountains where prevailing Pacific weather systems are funneled through mountain valleys. The park's geography effectively channels strong southwesterly winds, creating ideal conditions for chinook development.

One of the most recognizable signs of a chinook is the chinook arch, a long, curved band of cloud that forms parallel to the mountains. The arch develops as air flows over the mountains, creating atmospheric waves, similar to ripples formed by water flowing around a rock.

"If you don't like the weather, wait five minutes"

In only a matter of hours, chinooks can raise temperatures rapidly, and wind speeds can exceed 120 km/h (75 mph). Winter temperatures can swing from well below freezing to above 10°C (50°F). 

Wettest area in Alberta

Waterton receives Alberta's highest average annual precipitation, but annual moisture levels vary dramatically across the park:

• Cameron Lake: approximately 1520 mm (60 in)
• Waterton Townsite: approximately 1070 mm (42 in)
• Park gate: approximately 760 mm (30 in)

Much of the precipitation falls as snow, with the townsite averaging about 5750 mm (225 in) of snowfall annually. Slow melting, snow-packed bowls and alpine valleys help keep streams and rivers flowing in summertime. In most years, spring runoff is contained in streams, rivers, and lakes then absorbed by soil and plants. Occasionally, a combination of heavy June rains, warm temperatures, and a large melting snowpack has resulted in flooding.