Weather in Summit Valley, MT
Summit Valley, Sunday, 11 October, 20:30
Snow. Feels like 29°. High 36°, low 29°.
Monthly outlook for Summit Valley, MT: average high 52°, average low 35.4°. That is 2.4° below the climate normal for October. Precipitation is expected on 2 days (about 1.4 inches), against a normal of 4 days and 0.8 inches. The warmest day looks like 18 October (68.2°), the coolest 13 October (22.9°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 11 October – 20 October | 51.3° | 57.3° | -3.3° |
| 21 October – 30 October | 53.1° | 52.8° | +0.2° |
| 31 October – 9 November | at normal | 46.4° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Cardwell (7 mi).
0.02Summit Valley, Monday, 12 October
Light snow. High 34°, low 24°.
0
Summit Valley, Tuesday, 13 October
Mostly clear. High 38°, low 23°.
0
Summit Valley, Wednesday, 14 October
Clear. High 49°, low 28°.
0Summit Valley, Thursday, 15 October
Clear. High 49°, low 34°.
0Summit Valley, Friday, 16 October
Clear. High 61°, low 36°.
0
Summit Valley, Saturday, 17 October
Overcast. High 63°, low 40°.
0Summit Valley, Sunday, 18 October
Overcast. High 68°, low 50°.
0Summit Valley, Monday, 19 October
Overcast. High 67°, low 45°.
0.43Summit Valley, Tuesday, 20 October
Snow. High 48°, low 38°.
0Summit Valley, Wednesday, 21 October
Overcast. High 46°, low 34°.
0Summit Valley, Thursday, 22 October
Overcast. High 56°, low 37°.
0Summit Valley, Friday, 23 October
Overcast. High 63°, low 38°.
0.02
Summit Valley, Saturday, 24 October
Light rain. High 50°, low 38°.
0Summit Valley, Sunday, 25 October
Mostly clear. High 52°, low 34°.
0Summit Valley, Monday, 26 October
Clear. High 52°, low 38°.
0.03
Summit Valley, Tuesday, 27 October
Climate normal for this date — 60-year average.
0.06
Summit Valley, Wednesday, 28 October
Climate normal for this date — 60-year average.
0.06Summit Valley, Thursday, 29 October
Climate normal for this date — 60-year average.
0.04Summit Valley, Friday, 30 October
Climate normal for this date — 60-year average.
0.05Summit Valley, Saturday, 31 October
Climate normal for this date — 60-year average.
0.04Summit Valley, Sunday, 1 November
Climate normal for this date — 60-year average.
0.03Summit Valley, Monday, 2 November
Climate normal for this date — 60-year average.
0.04Summit Valley, Tuesday, 3 November
Climate normal for this date — 60-year average.
0.04Summit Valley, Wednesday, 4 November
Climate normal for this date — 60-year average.
0.04Summit Valley, Thursday, 5 November
Climate normal for this date — 60-year average.
0.04Summit Valley, Friday, 6 November
Climate normal for this date — 60-year average.
0.04Summit Valley, Saturday, 7 November
Climate normal for this date — 60-year average.
0.07Summit Valley, Sunday, 8 November
Climate normal for this date — 60-year average.
0.04Summit Valley, Monday, 9 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 Summit 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 Summit 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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