Weather in Big Arm, MT
Big Arm, Thursday, 15 October, 09:38
Mostly clear. Feels like 35°. High 58°, low 36°.
Monthly outlook for Big Arm, MT: average high 50.5°, average low 37.8°. That is 0.8° below the climate normal for October. Precipitation is expected on 3 days (about 0.9 inches), against a normal of 7 days and 1.5 inches. The warmest day looks like 17 October (64.7°), the coolest 30 October (24.9°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 15 October – 24 October | 56.8° | 54° | +1.6° |
| 25 October – 3 November | 40.1° | 47.5° | -4.1° |
| 4 November – 13 November | at normal | 42.9° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Turtle Lake (12 mi).
0
Big Arm, Friday, 16 October
Overcast. High 63°, low 36°.
0Big Arm, Saturday, 17 October
Overcast. High 65°, low 45°.
0
Big Arm, Sunday, 18 October
Clear. High 55°, low 42°.
0Big Arm, Monday, 19 October
Overcast. High 61°, low 45°.
0Big Arm, Tuesday, 20 October
Overcast. High 61°, low 49°.
0.24
Big Arm, Wednesday, 21 October
Rain. High 58°, low 47°.
0Big Arm, Thursday, 22 October
Overcast. High 56°, low 44°.
0.03Big Arm, Friday, 23 October
Light rain. High 48°, low 38°.
0Big Arm, Saturday, 24 October
Overcast. High 44°, low 32°.
0Big Arm, Sunday, 25 October
Light rain. High 46°, low 37°.
0Big Arm, Monday, 26 October
Mostly clear. High 46°, low 33°.
0.3
Big Arm, Tuesday, 27 October
Snow. High 38°, low 34°.
0.34Big Arm, Wednesday, 28 October
Snow. High 37°, low 34°.
0.02Big Arm, Thursday, 29 October
Light rain. High 36°, low 27°.
0Big Arm, Friday, 30 October
Overcast. High 37°, low 25°.
0.12Big Arm, Saturday, 31 October
Climate normal for this date — 60-year average.
0.12
Big Arm, Sunday, 1 November
Climate normal for this date — 60-year average.
0.13Big Arm, Monday, 2 November
Climate normal for this date — 60-year average.
0.07Big Arm, Tuesday, 3 November
Climate normal for this date — 60-year average.
0.14Big Arm, Wednesday, 4 November
Climate normal for this date — 60-year average.
0.12Big Arm, Thursday, 5 November
Climate normal for this date — 60-year average.
0.14Big Arm, Friday, 6 November
Climate normal for this date — 60-year average.
0.15Big Arm, Saturday, 7 November
Climate normal for this date — 60-year average.
0.1Big Arm, Sunday, 8 November
Climate normal for this date — 60-year average.
0.12Big Arm, Monday, 9 November
Climate normal for this date — 60-year average.
0.1Big Arm, Tuesday, 10 November
Climate normal for this date — 60-year average.
0.11Big Arm, Wednesday, 11 November
Climate normal for this date — 60-year average.
0.11Big Arm, Thursday, 12 November
Climate normal for this date — 60-year average.
0.09Big Arm, Friday, 13 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 Big Arm, 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 Big Arm, 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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