Weather in Big Arm, MT
Big Arm, Friday, 9 October, 19:26
Overcast. Feels like 59°. High 71°, low 44°.
Monthly outlook for Big Arm, MT: average high 51.3°, average low 36.8°. That is 1.9° below the climate normal for October. Precipitation is expected on 5 days (about 0.4 inches), against a normal of 6 days and 1.4 inches. The warmest day looks like 9 October (70.6°), the coolest 11 October (26.4°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 9 October – 18 October | 52.9° | 55.6° | -1.5° |
| 19 October – 28 October | 48.6° | 51.8° | -1.8° |
| 29 October – 7 November | at normal | 45.4° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Turtle Lake (12 mi).
0.06
Big Arm, Saturday, 10 October
Light rain. High 51°, low 31°.
0.15
Big Arm, Sunday, 11 October
Snow. High 38°, low 26°.
0.02Big Arm, Monday, 12 October
Light snow. High 45°, low 32°.
0
Big Arm, Tuesday, 13 October
Clear. High 49°, low 35°.
0Big Arm, Wednesday, 14 October
Clear. High 53°, low 39°.
0Big Arm, Thursday, 15 October
Overcast. High 53°, low 44°.
0Big Arm, Friday, 16 October
Overcast. High 53°, low 37°.
0Big Arm, Saturday, 17 October
Overcast. High 59°, low 37°.
0Big Arm, Sunday, 18 October
Overcast. High 58°, low 39°.
0.06Big Arm, Monday, 19 October
Light rain. High 49°, low 44°.
0.05Big Arm, Tuesday, 20 October
Light rain. High 47°, low 40°.
0Big Arm, Wednesday, 21 October
Overcast. High 49°, low 35°.
0.08Big Arm, Thursday, 22 October
Light rain. High 47°, low 38°.
0Big Arm, Friday, 23 October
Overcast. High 48°, low 36°.
0Big Arm, Saturday, 24 October
Overcast. High 51°, low 32°.
0.07
Big Arm, Sunday, 25 October
Climate normal for this date — 60-year average.
0.11Big Arm, Monday, 26 October
Climate normal for this date — 60-year average.
0.12Big Arm, Tuesday, 27 October
Climate normal for this date — 60-year average.
0.1Big Arm, Wednesday, 28 October
Climate normal for this date — 60-year average.
0.11Big 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.
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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