Weather in Big Arm, MT
Big Arm, Saturday, 10 October, 07:50
Overcast. Feels like 42°. High 48°, low 39°.
Monthly outlook for Big Arm, MT: average high 53.6°, average low 39.4°. That is 0.4° below the climate normal for October. Precipitation is expected on 4 days (about 0.5 inches), against a normal of 6 days and 1.4 inches. The warmest day looks like 18 October (64.9°), the coolest 11 October (29.5°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 10 October – 19 October | 52.5° | 55.2° | -1.5° |
| 20 October – 29 October | 55.4° | 51° | +2.4° |
| 30 October – 8 November | at normal | 45° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Turtle Lake (12 mi).
0.17
Big Arm, Sunday, 11 October
Snow. High 40°, low 29°.
0.01Big Arm, Monday, 12 October
Light snow. High 45°, low 30°.
0
Big Arm, Tuesday, 13 October
Partly cloudy. High 48°, low 34°.
0
Big Arm, Wednesday, 14 October
Clear. High 52°, low 39°.
0Big Arm, Thursday, 15 October
Clear. High 57°, low 42°.
0Big Arm, Friday, 16 October
Partly cloudy. High 54°, low 39°.
0Big Arm, Saturday, 17 October
Overcast. High 60°, low 38°.
0Big Arm, Sunday, 18 October
Overcast. High 65°, low 45°.
0.05
Big Arm, Monday, 19 October
Light rain. High 56°, low 41°.
0.15Big Arm, Tuesday, 20 October
Rain. High 52°, low 43°.
0.01Big Arm, Wednesday, 21 October
Light rain. High 56°, low 41°.
0Big Arm, Thursday, 22 October
Overcast. High 52°, low 37°.
0Big Arm, Friday, 23 October
Overcast. High 55°, low 44°.
0Big Arm, Saturday, 24 October
Overcast. High 60°, low 46°.
0Big Arm, Sunday, 25 October
Overcast. High 58°, low 44°.
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.
0.1
Big 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.
0.1Big Arm, Sunday, 8 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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