Weather in Chelsea, MT
Chelsea, Wednesday, 21 October, 05:14
Clear. Feels like 28°. High 70°, low 28°.
Monthly outlook for Chelsea, MT: average high 52.7°, average low 34.8°. That is 1.4° above the climate normal for October. Precipitation is expected on 2 days (about 1.9 inches), against a normal of 3 days and 0.4 inches. The warmest day looks like 23 October (69.9°), the coolest 5 November (23.1°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 21 October – 30 October | 54.3° | 52.2° | +1.2° |
| 31 October – 9 November | 50° | 45.4° | +2.5° |
| 10 November – 19 November | at normal | 39.9° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Poplar (7 mi).
0
Chelsea, Thursday, 22 October
Clear. High 69°, low 36°.
0.02
Chelsea, Friday, 23 October
Light rain. High 70°, low 47°.
0Chelsea, Saturday, 24 October
Clear. High 47°, low 36°.
0
Chelsea, Sunday, 25 October
Mostly clear. High 46°, low 30°.
0Chelsea, Monday, 26 October
Clear. High 48°, low 31°.
0.01Chelsea, Tuesday, 27 October
Light rain. High 45°, low 33°.
0.04
Chelsea, Wednesday, 28 October
Snow. High 43°, low 35°.
0Chelsea, Thursday, 29 October
Clear. High 48°, low 30°.
0Chelsea, Friday, 30 October
Clear. High 56°, low 34°.
0Chelsea, Saturday, 31 October
Clear. High 56°, low 41°.
0Chelsea, Sunday, 1 November
Clear. High 64°, low 42°.
0Chelsea, Monday, 2 November
Mostly clear. High 64°, low 48°.
1.05Chelsea, Tuesday, 3 November
Snow. High 52°, low 33°.
0.83Chelsea, Wednesday, 4 November
Snow. High 34°, low 31°.
0
Chelsea, Thursday, 5 November
Overcast. High 32°, low 23°.
0.02Chelsea, Friday, 6 November
Climate normal for this date — 60-year average.
0.02Chelsea, Saturday, 7 November
Climate normal for this date — 60-year average.
0.03
Chelsea, Sunday, 8 November
Climate normal for this date — 60-year average.
0.04Chelsea, Monday, 9 November
Climate normal for this date — 60-year average.
0.04Chelsea, Tuesday, 10 November
Climate normal for this date — 60-year average.
0.01Chelsea, Wednesday, 11 November
Climate normal for this date — 60-year average.
0.03Chelsea, Thursday, 12 November
Climate normal for this date — 60-year average.
0.02Chelsea, Friday, 13 November
Climate normal for this date — 60-year average.
0.03Chelsea, Saturday, 14 November
Climate normal for this date — 60-year average.
0.02Chelsea, Sunday, 15 November
Climate normal for this date — 60-year average.
0.02Chelsea, Monday, 16 November
Climate normal for this date — 60-year average.
0.02Chelsea, Tuesday, 17 November
Climate normal for this date — 60-year average.
0.03Chelsea, Wednesday, 18 November
Climate normal for this date — 60-year average.
0.02Chelsea, Thursday, 19 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 Chelsea, 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 Chelsea, 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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