Weather in Big Arm, MT
Big Arm, Sunday, 11 October, 03:38
Overcast. Feels like 33°. High 39°, low 34°.
Monthly outlook for Big Arm, MT: average high 55.3°, average low 38.9°. That is 0.8° above the climate normal for October. Precipitation is expected on 1 day (about 0.2 inches), against a normal of 6 days and 1.5 inches. The warmest day looks like 18 October (67.5°), the coolest 12 October (30.1°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 11 October – 20 October | 55° | 55° | +0° |
| 21 October – 30 October | 55.7° | 50.1° | +3.1° |
| 31 October – 9 November | at normal | 44.6° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Turtle Lake (12 mi).
0.01
Big Arm, Monday, 12 October
Light snow. High 46°, low 30°.
0
Big Arm, Tuesday, 13 October
Partly cloudy. High 50°, low 34°.
0Big Arm, Wednesday, 14 October
Partly cloudy. High 53°, low 38°.
0
Big Arm, Thursday, 15 October
Mostly clear. High 58°, low 42°.
0
Big Arm, Friday, 16 October
Clear. High 61°, low 46°.
0Big Arm, Saturday, 17 October
Overcast. High 62°, low 39°.
0Big Arm, Sunday, 18 October
Overcast. High 68°, low 44°.
0.02
Big Arm, Monday, 19 October
Light rain. High 59°, low 44°.
0Big Arm, Tuesday, 20 October
Light rain. High 54°, low 39°.
0Big Arm, Wednesday, 21 October
Light rain. High 54°, low 37°.
0Big Arm, Thursday, 22 October
Overcast. High 53°, low 43°.
0Big Arm, Friday, 23 October
Mostly clear. High 56°, low 38°.
0Big Arm, Saturday, 24 October
Partly cloudy. High 54°, low 39°.
0Big Arm, Sunday, 25 October
Clear. High 56°, low 38°.
0Big Arm, Monday, 26 October
Clear. High 60°, low 38°.
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.
0.12Big Arm, Monday, 9 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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