Weather in Grannis, MT
Grannis, Friday, 9 October, 06:50
Overcast. Feels like 53°. High 82°, low 47°.
Monthly outlook for Grannis, MT: average high 52.8°, average low 35.6°. That is 0.1° below the climate normal for October. Precipitation is expected on 5 days (about 1.6 inches), against a normal of 4 days and 0.9 inches. The warmest day looks like 9 October (81.8°), the coolest 13 October (24.4°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 9 October – 18 October | 53.2° | 53.6° | -0.2° |
| 19 October – 28 October | 52.3° | 50.6° | +0.9° |
| 29 October – 7 November | at normal | 43.8° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Clyde Park (10 mi).
0.58
Grannis, Saturday, 10 October
Rain. High 61°, low 42°.
0.48
Grannis, Sunday, 11 October
Snow. High 41°, low 34°.
0.27Grannis, Monday, 12 October
Snow. High 34°, low 28°.
0Grannis, Tuesday, 13 October
Overcast. High 44°, low 24°.
0
Grannis, Wednesday, 14 October
Partly cloudy. High 51°, low 28°.
0.13Grannis, Thursday, 15 October
Snow. High 40°, low 32°.
0
Grannis, Friday, 16 October
Clear. High 54°, low 26°.
0Grannis, Saturday, 17 October
Overcast. High 63°, low 36°.
0Grannis, Sunday, 18 October
Overcast. High 62°, low 40°.
0Grannis, Monday, 19 October
Overcast. High 66°, low 41°.
0Grannis, Tuesday, 20 October
Overcast. High 59°, low 41°.
0.13Grannis, Wednesday, 21 October
Snow. High 43°, low 37°.
0.02Grannis, Thursday, 22 October
Light rain. High 41°, low 37°.
0Grannis, Friday, 23 October
Overcast. High 48°, low 41°.
0Grannis, Saturday, 24 October
Overcast. High 56°, low 36°.
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.
0.04Grannis, Saturday, 7 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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