Weather in Sumner, MT
Sumner, Tuesday, 6 October, 20:45
Overcast. Feels like 53°. High 73°, low 42°.
Monthly outlook for Sumner, MT: average high 57.8°, average low 39.8°. That is 1.4° above the climate normal for October. Precipitation is expected on 0 days (about 0.0 inches), against a normal of 2 days and 0.4 inches. The warmest day looks like 9 October (75.7°), the coolest 17 October (31°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 6 October – 15 October | 58° | 56° | +1.1° |
| 16 October – 25 October | 57.4° | 53° | +2.5° |
| 26 October – 4 November | at normal | 46.1° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Caldwell (14 mi).
0Sumner, Wednesday, 7 October
Overcast. High 66°, low 43°.
0
Sumner, Thursday, 8 October
Partly cloudy. High 71°, low 45°.
0Sumner, Friday, 9 October
Overcast. High 76°, low 51°.
0Sumner, Saturday, 10 October
Overcast. High 61°, low 40°.
0Sumner, Sunday, 11 October
Overcast. High 37°, low 34°.
0Sumner, Monday, 12 October
Overcast. High 43°, low 31°.
0
Sumner, Tuesday, 13 October
Clear. High 59°, low 36°.
0
Sumner, Wednesday, 14 October
Mostly clear. High 50°, low 40°.
0Sumner, Thursday, 15 October
Clear. High 46°, low 36°.
0Sumner, Friday, 16 October
Clear. High 46°, low 33°.
0Sumner, Saturday, 17 October
Overcast. High 60°, low 31°.
0Sumner, Sunday, 18 October
Overcast. High 58°, low 43°.
0Sumner, Monday, 19 October
Overcast. High 59°, low 45°.
0Sumner, Tuesday, 20 October
Overcast. High 62°, low 43°.
0Sumner, Wednesday, 21 October
Clear. High 60°, low 47°.
0.04Sumner, Thursday, 22 October
Climate normal for this date — 60-year average.
0.04Sumner, Friday, 23 October
Climate normal for this date — 60-year average.
0.01Sumner, Saturday, 24 October
Climate normal for this date — 60-year average.
0.01Sumner, Sunday, 25 October
Climate normal for this date — 60-year average.
0.04Sumner, Monday, 26 October
Climate normal for this date — 60-year average.
0.03Sumner, Tuesday, 27 October
Climate normal for this date — 60-year average.
0.02Sumner, Wednesday, 28 October
Climate normal for this date — 60-year average.
0.03Sumner, Thursday, 29 October
Climate normal for this date — 60-year average.
0.02Sumner, Friday, 30 October
Climate normal for this date — 60-year average.
0.03Sumner, Saturday, 31 October
Climate normal for this date — 60-year average.
0.01Sumner, Sunday, 1 November
Climate normal for this date — 60-year average.
0.02Sumner, Monday, 2 November
Climate normal for this date — 60-year average.
0.03Sumner, Tuesday, 3 November
Climate normal for this date — 60-year average.
0.02Sumner, Wednesday, 4 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 Sumner, 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 Sumner, 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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