Weather in Waltham, MT
Waltham, Sunday, 18 October, 09:16
Mostly clear. Feels like 45°. High 62°, low 42°.
Monthly outlook for Waltham, MT: average high 49.5°, average low 34.3°. That is 2.7° below the climate normal for October. Precipitation is expected on 4 days (about 0.8 inches), against a normal of 3 days and 0.5 inches. The warmest day looks like 19 October (69.3°), the coolest 30 October (18.5°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 18 October – 27 October | 54.8° | 56.5° | -0.9° |
| 28 October – 6 November | 40.5° | 50° | -5.3° |
| 7 November – 16 November | at normal | 45.3° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Carter (15 mi).
0
Waltham, Monday, 19 October
Overcast. High 69°, low 37°.
0Waltham, Tuesday, 20 October
Overcast. High 58°, low 39°.
0Waltham, Wednesday, 21 October
Mostly clear. High 63°, low 39°.
0.01
Waltham, Thursday, 22 October
Light rain. High 65°, low 47°.
0.39Waltham, Friday, 23 October
Rain. High 50°, low 46°.
0Waltham, Saturday, 24 October
Overcast. High 44°, low 34°.
0Waltham, Sunday, 25 October
Overcast. High 46°, low 37°.
0Waltham, Monday, 26 October
Overcast. High 46°, low 37°.
0.04
Waltham, Tuesday, 27 October
Light snow. High 43°, low 35°.
0.08Waltham, Wednesday, 28 October
Light snow. High 51°, low 35°.
0.27Waltham, Thursday, 29 October
Snow. High 36°, low 25°.
0.01Waltham, Friday, 30 October
Light snow. High 33°, low 19°.
0
Waltham, Saturday, 31 October
Partly cloudy. High 37°, low 20°.
0Waltham, Sunday, 1 November
Overcast. High 38°, low 24°.
0.01Waltham, Monday, 2 November
Light snow. High 48°, low 31°.
0.02Waltham, Tuesday, 3 November
Climate normal for this date — 60-year average.
0.04Waltham, Wednesday, 4 November
Climate normal for this date — 60-year average.
0.04Waltham, Thursday, 5 November
Climate normal for this date — 60-year average.
0.03Waltham, Friday, 6 November
Climate normal for this date — 60-year average.
0.02Waltham, Saturday, 7 November
Climate normal for this date — 60-year average.
0.05Waltham, Sunday, 8 November
Climate normal for this date — 60-year average.
0.04Waltham, Monday, 9 November
Climate normal for this date — 60-year average.
0.03Waltham, Tuesday, 10 November
Climate normal for this date — 60-year average.
0.03Waltham, Wednesday, 11 November
Climate normal for this date — 60-year average.
0.02Waltham, Thursday, 12 November
Climate normal for this date — 60-year average.
0.02Waltham, Friday, 13 November
Climate normal for this date — 60-year average.
0.03Waltham, Saturday, 14 November
Climate normal for this date — 60-year average.
0.01Waltham, Sunday, 15 November
Climate normal for this date — 60-year average.
0.03Waltham, Monday, 16 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 Waltham, 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 Waltham, 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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