Weather in Big Arm, MT
Big Arm, Tuesday, 13 October, 00:16
Clear. Feels like 32°. High 53°, low 32°.
Monthly outlook for Big Arm, MT: average high 54°, average low 39.2°. That is 0.6° above the climate normal for October. Precipitation is expected on 2 days (about 0.4 inches), against a normal of 7 days and 1.5 inches. The warmest day looks like 17 October (64.2°), the coolest 13 October (32.2°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 13 October – 22 October | 55.7° | 54.5° | +0.7° |
| 23 October – 1 November | 51.1° | 48.7° | +1.4° |
| 2 November – 11 November | at normal | 43.7° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Turtle Lake (12 mi).
0
Big Arm, Wednesday, 14 October
Clear. High 54°, low 36°.
0
Big Arm, Thursday, 15 October
Mostly clear. High 56°, low 41°.
0Big Arm, Friday, 16 October
Clear. High 61°, low 46°.
0
Big Arm, Saturday, 17 October
Overcast. High 64°, low 47°.
0Big Arm, Sunday, 18 October
Mostly clear. High 61°, low 43°.
0Big Arm, Monday, 19 October
Overcast. High 63°, low 45°.
0.29
Big Arm, Tuesday, 20 October
Rain. High 52°, low 41°.
0Big Arm, Wednesday, 21 October
Overcast. High 47°, low 34°.
0.01Big Arm, Thursday, 22 October
Light rain. High 45°, low 32°.
0.12Big Arm, Friday, 23 October
Light rain. High 45°, low 39°.
0Big Arm, Saturday, 24 October
Overcast. High 48°, low 34°.
0Big Arm, Sunday, 25 October
Overcast. High 51°, low 36°.
0Big Arm, Monday, 26 October
Mostly clear. High 53°, low 38°.
0Big Arm, Tuesday, 27 October
Mostly clear. High 56°, low 40°.
0Big Arm, Wednesday, 28 October
Clear. High 53°, low 41°.
0.11
Big Arm, Thursday, 29 October
Climate normal for this date — 60-year average.
0.08Big Arm, Friday, 30 October
Climate normal for this date — 60-year average.
0.12Big Arm, Saturday, 31 October
Climate normal for this date — 60-year average.
0.12Big 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.
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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