Sperry Chalets, Sunday, 11 October, 01:11
Light snow. Feels like 20°. High 28°, low 19°.
Sperry Chalets, Monday, 12 October
Partly cloudy. High 37°, low 16°.
Sperry Chalets, Tuesday, 13 October
Clear. High 41°, low 24°.
Sperry Chalets, Wednesday, 14 October
Partly cloudy. High 45°, low 31°.
Sperry Chalets, Thursday, 15 October
Clear. High 51°, low 32°.
Sperry Chalets, Friday, 16 October
Mostly clear. High 49°, low 30°.
Sperry Chalets, Saturday, 17 October
Overcast. High 47°, low 27°.
Sperry Chalets, Sunday, 18 October
Clear. High 49°, low 30°.
Sperry Chalets, Monday, 19 October
Mostly clear. High 47°, low 32°.
Sperry Chalets, Tuesday, 20 October
Snow. High 38°, low 30°.
Sperry Chalets, Wednesday, 21 October
Overcast. High 38°, low 23°.
Sperry Chalets, Thursday, 22 October
Overcast. High 43°, low 24°.
Sperry Chalets, Friday, 23 October
Partly cloudy. High 47°, low 28°.
Sperry Chalets, Saturday, 24 October
Clear. High 48°, low 29°.
Sperry Chalets, Sunday, 25 October
Overcast. High 45°, low 30°.
Sperry Chalets, Monday, 26 October
Overcast. High 36°, low 25°.
The first 16 days come from weather models — reliable for the first 3–5 days and progressively less so after that. Days 17 through 30 for Sperry Chalets, MT are built from the climate normal, the 60-year average, so they show typical weather for those dates rather than a specific forecast.
We compare the forecast against the climate normal for those exact calendar days, computed from 60 years of observations. The deviation shows how much the coming month differs from a typical one.
They are real temperature extremes recorded in Sperry Chalets, MT since 1960: the highest and lowest reading for each calendar date, with the year it happened.
The forecast portion refreshes every hour; the climate portion is based on long-term data and stays stable.