Weather in Grass Valley, MT
Grass Valley, Wednesday, 21 October, 02:33
Clear. Feels like 39°. High 65°, low 35°.
Monthly outlook for Grass Valley, MT: average high 49.9°, average low 31.6°. That is 3.3° above the climate normal for October. Precipitation is expected on 3 days (about 1.3 inches), against a normal of 6 days and 1.2 inches. The warmest day looks like 22 October (66.1°), the coolest 28 October (21.1°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 21 October – 30 October | 50.7° | 45.7° | +2.8° |
| 31 October – 9 November | 48.5° | 40.1° | +4.7° |
| 10 November – 19 November | at normal | 36.1° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Evaro (11 mi).
0.02
Grass Valley, Thursday, 22 October
Light rain. High 66°, low 36°.
0.72Grass Valley, Friday, 23 October
Rain. High 47°, low 42°.
0
Grass Valley, Saturday, 24 October
Overcast. High 49°, low 33°.
0
Grass Valley, Sunday, 25 October
Mostly clear. High 54°, low 34°.
0.02Grass Valley, Monday, 26 October
Light rain. High 51°, low 32°.
0.02
Grass Valley, Tuesday, 27 October
Light snow. High 38°, low 24°.
0Grass Valley, Wednesday, 28 October
Overcast. High 41°, low 21°.
0Grass Valley, Thursday, 29 October
Overcast. High 44°, low 24°.
0Grass Valley, Friday, 30 October
Overcast. High 51°, low 27°.
0Grass Valley, Saturday, 31 October
Overcast. High 54°, low 34°.
0.03Grass Valley, Sunday, 1 November
Light rain. High 57°, low 42°.
0.22Grass Valley, Monday, 2 November
Rain. High 51°, low 39°.
0.27Grass Valley, Tuesday, 3 November
Snow. High 44°, low 28°.
0Grass Valley, Wednesday, 4 November
Overcast. High 41°, low 29°.
0Grass Valley, Thursday, 5 November
Mostly clear. High 44°, low 24°.
0.1
Grass Valley, Friday, 6 November
Climate normal for this date — 60-year average.
0.11Grass Valley, Saturday, 7 November
Climate normal for this date — 60-year average.
0.07Grass Valley, Sunday, 8 November
Climate normal for this date — 60-year average.
0.07Grass Valley, Monday, 9 November
Climate normal for this date — 60-year average.
0.06Grass Valley, Tuesday, 10 November
Climate normal for this date — 60-year average.
0.07Grass Valley, Wednesday, 11 November
Climate normal for this date — 60-year average.
0.08Grass Valley, Thursday, 12 November
Climate normal for this date — 60-year average.
0.09Grass Valley, Friday, 13 November
Climate normal for this date — 60-year average.
0.08Grass Valley, Saturday, 14 November
Climate normal for this date — 60-year average.
0.03Grass Valley, Sunday, 15 November
Climate normal for this date — 60-year average.
0.08Grass Valley, Monday, 16 November
Climate normal for this date — 60-year average.
0.07Grass Valley, Tuesday, 17 November
Climate normal for this date — 60-year average.
0.09Grass Valley, Wednesday, 18 November
Climate normal for this date — 60-year average.
0.07Grass Valley, Thursday, 19 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 Grass Valley, 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 Grass Valley, 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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