Weather in Sweet Grass, MT
Sweet Grass, Thursday, 15 October, 07:30
Clear. Feels like 31°. High 51°, low 34°.
Monthly outlook for Sweet Grass, MT: average high 49.3°, average low 36.4°. That is 1.6° below the climate normal for October. Precipitation is expected on 4 days (about 0.4 inches), against a normal of 3 days and 0.4 inches. The warmest day looks like 17 October (67.8°), the coolest 30 October (28.1°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 15 October – 24 October | 56.6° | 54.2° | +1.3° |
| 25 October – 3 November | 37.2° | 47.6° | -5.8° |
| 4 November – 13 November | at normal | 42° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Sunburst (8 mi).
0
Sweet Grass, Friday, 16 October
Partly cloudy. High 65°, low 36°.
0
Sweet Grass, Saturday, 17 October
Overcast. High 68°, low 48°.
0
Sweet Grass, Sunday, 18 October
Clear. High 59°, low 36°.
0Sweet Grass, Monday, 19 October
Overcast. High 59°, low 40°.
0Sweet Grass, Tuesday, 20 October
Overcast. High 63°, low 43°.
0Sweet Grass, Wednesday, 21 October
Overcast. High 57°, low 39°.
0Sweet Grass, Thursday, 22 October
Partly cloudy. High 57°, low 46°.
0.09
Sweet Grass, Friday, 23 October
Snow. High 44°, low 36°.
0.01Sweet Grass, Saturday, 24 October
Light snow. High 42°, low 33°.
0.01Sweet Grass, Sunday, 25 October
Light snow. High 39°, low 32°.
0.01Sweet Grass, Monday, 26 October
Light snow. High 37°, low 29°.
0.11Sweet Grass, Tuesday, 27 October
Snow. High 36°, low 34°.
0.1Sweet Grass, Wednesday, 28 October
Snow. High 36°, low 33°.
0Sweet Grass, Thursday, 29 October
Overcast. High 41°, low 34°.
0.1Sweet Grass, Friday, 30 October
Light snow. High 35°, low 28°.
0.04Sweet Grass, Saturday, 31 October
Climate normal for this date — 60-year average.
0.02Sweet Grass, Sunday, 1 November
Climate normal for this date — 60-year average.
0.04Sweet Grass, Monday, 2 November
Climate normal for this date — 60-year average.
0.02Sweet Grass, Tuesday, 3 November
Climate normal for this date — 60-year average.
0.04Sweet Grass, Wednesday, 4 November
Climate normal for this date — 60-year average.
0.04Sweet Grass, Thursday, 5 November
Climate normal for this date — 60-year average.
0.02
Sweet Grass, Friday, 6 November
Climate normal for this date — 60-year average.
0.03Sweet Grass, Saturday, 7 November
Climate normal for this date — 60-year average.
0.04Sweet Grass, Sunday, 8 November
Climate normal for this date — 60-year average.
0.06Sweet Grass, Monday, 9 November
Climate normal for this date — 60-year average.
0.03Sweet Grass, Tuesday, 10 November
Climate normal for this date — 60-year average.
0.02Sweet Grass, Wednesday, 11 November
Climate normal for this date — 60-year average.
0.02Sweet Grass, Thursday, 12 November
Climate normal for this date — 60-year average.
0.01Sweet Grass, Friday, 13 November
Climate normal for this date — 60-year average.
About the monthly outlook
How accurate is a 30-day forecast?
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 Sweet Grass, MT are built from the climate normal, the 60-year average, so they show typical weather for those dates rather than a specific forecast.
What does "above normal" mean?
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.
Where do the 66-year records come from?
They are real temperature extremes recorded in Sweet Grass, MT since 1960: the highest and lowest reading for each calendar date, with the year it happened.
How often is it updated?
The forecast portion refreshes every hour; the climate portion is based on long-term data and stays stable.
Sun and moon today
Weather history
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