Elevation matters

The National Park Service says higher elevations such as Logan Pass are generally 10 to 15 degrees Fahrenheit cooler than West Glacier. Overnight temperatures can reach freezing, and snow can occur in any month.

The Divide matters

Moist Pacific air from the west and colder, drier air from the northeast meet at the Continental Divide. The west is generally wetter, while the east is often cooler, sunnier, and much windier.

Sources and verification