Weather in Grannis, MT
Grannis, Thursday, 8 October, 10:33
Clear. Feels like 49°. High 77°, low 40°.
Monthly outlook for Grannis, MT: average high 51.7°, average low 32.5°. That is 0.9° below the climate normal for October. Precipitation is expected on 6 days (about 3.0 inches), against a normal of 4 days and 1.0 inches. The warmest day looks like 9 October (81.8°), the coolest 16 October (18.1°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 8 October – 17 October | 50.6° | 54° | -1.9° |
| 18 October – 27 October | 53.7° | 51.2° | +1.4° |
| 28 October – 6 November | at normal | 44.3° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Clyde Park (10 mi).
0
Grannis, Friday, 9 October
Partly cloudy. High 82°, low 40°.
0.48
Grannis, Saturday, 10 October
Rain. High 61°, low 42°.
0.28
Grannis, Sunday, 11 October
Snow. High 41°, low 33°.
0.6Grannis, Monday, 12 October
Snow. High 34°, low 29°.
0Grannis, Tuesday, 13 October
Clear. High 38°, low 27°.
0.46Grannis, Wednesday, 14 October
Rain. High 51°, low 33°.
0.64Grannis, Thursday, 15 October
Snow. High 36°, low 28°.
0Grannis, Friday, 16 October
Clear. High 39°, low 18°.
0Grannis, Saturday, 17 October
Clear. High 48°, low 26°.
0Grannis, Sunday, 18 October
Clear. High 52°, low 32°.
0Grannis, Monday, 19 October
Partly cloudy. High 57°, low 34°.
0Grannis, Tuesday, 20 October
Clear. High 60°, low 36°.
0Grannis, Wednesday, 21 October
Partly cloudy. High 54°, low 38°.
0
Grannis, Thursday, 22 October
Overcast. High 57°, low 34°.
0.56Grannis, Friday, 23 October
Snow. High 43°, low 29°.
0.04Grannis, Saturday, 24 October
Climate normal for this date — 60-year average.
0.04Grannis, Sunday, 25 October
Climate normal for this date — 60-year average.
0.07
Grannis, Monday, 26 October
Climate normal for this date — 60-year average.
0.04Grannis, Tuesday, 27 October
Climate normal for this date — 60-year average.
0.06Grannis, Wednesday, 28 October
Climate normal for this date — 60-year average.
0.06Grannis, Thursday, 29 October
Climate normal for this date — 60-year average.
0.04Grannis, Friday, 30 October
Climate normal for this date — 60-year average.
0.06Grannis, Saturday, 31 October
Climate normal for this date — 60-year average.
0.06Grannis, Sunday, 1 November
Climate normal for this date — 60-year average.
0.03Grannis, Monday, 2 November
Climate normal for this date — 60-year average.
0.04Grannis, Tuesday, 3 November
Climate normal for this date — 60-year average.
0.05Grannis, Wednesday, 4 November
Climate normal for this date — 60-year average.
0.06Grannis, Thursday, 5 November
Climate normal for this date — 60-year average.
0.05Grannis, Friday, 6 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 Grannis, 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 Grannis, 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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