Weather in Sweet Grass, MT
Sweet Grass, Sunday, 18 October, 13:59
Clear. Feels like 53°. High 56°, low 36°.
Monthly outlook for Sweet Grass, MT: average high 45.4°, average low 32.9°. That is 2.8° below the climate normal for October. Precipitation is expected on 5 days (about 0.5 inches), against a normal of 3 days and 0.5 inches. The warmest day looks like 22 October (61.7°), the coolest 30 October (22.5°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 18 October – 27 October | 50.5° | 52.8° | -1.3° |
| 28 October – 6 November | 37° | 45.9° | -5° |
| 7 November – 16 November | at normal | 41.2° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Sunburst (8 mi).
0
Sweet Grass, Monday, 19 October
Overcast. High 61°, low 36°.
0Sweet Grass, Tuesday, 20 October
Overcast. High 51°, low 37°.
0Sweet Grass, Wednesday, 21 October
Clear. High 60°, low 39°.
0
Sweet Grass, Thursday, 22 October
Partly cloudy. High 62°, low 43°.
0Sweet Grass, Friday, 23 October
Overcast. High 50°, low 40°.
0Sweet Grass, Saturday, 24 October
Overcast. High 40°, low 29°.
0.01
Sweet Grass, Sunday, 25 October
Light rain. High 42°, low 37°.
0.04
Sweet Grass, Monday, 26 October
Snow. High 43°, low 32°.
0.13Sweet Grass, Tuesday, 27 October
Snow. High 38°, low 33°.
0.07Sweet Grass, Wednesday, 28 October
Snow. High 43°, low 33°.
0.08Sweet Grass, Thursday, 29 October
Light snow. High 33°, low 25°.
0Sweet Grass, Friday, 30 October
Clear. High 34°, low 22°.
0Sweet Grass, Saturday, 31 October
Overcast. High 39°, low 25°.
0Sweet Grass, Sunday, 1 November
Overcast. High 35°, low 28°.
0.16Sweet Grass, Monday, 2 November
Snow. High 38°, low 29°.
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.
0.02Sweet Grass, Saturday, 14 November
Climate normal for this date — 60-year average.
0.01Sweet Grass, Sunday, 15 November
Climate normal for this date — 60-year average.
0.04Sweet Grass, Monday, 16 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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