Columbia Falls routinely gets 50 to 60 inches of snow across a season. Winters run long and cold, with daylight highs lingering right around freezing and nighttime lows dropping into the teens. November usually brings the first major snowstorm after a swift autumn transition from a pleasant September.
Summers are warm and dry with July and August highs in the 80s and cool crisp nights. June brings the annual rainfall peak, and spring snowmelt drives high river runoff before the valley warms into the mid-60s.
That combination, meaning heavy snow load, sustained cold, and a river valley that carries real moisture in spring and early summer, is what makes vapor management as important here as thermal performance.