Weather in Keystone, MT
Keystone, Wednesday, 7 October, 18:01
Mostly clear. Feels like 62°. High 65°, low 33°.
Monthly outlook for Keystone, MT: average high 49.6°, average low 28.8°. That is 5.2° below the climate normal for October. Precipitation is expected on 4 days (about 0.4 inches), against a normal of 5 days and 1.1 inches. The warmest day looks like 8 October (69.3°), the coolest 16 October (17.3°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 7 October – 16 October | 48.9° | 59.9° | -6.1° |
| 17 October – 26 October | 51° | 56.2° | -2.9° |
| 27 October – 5 November | at normal | 49.4° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — St. Regis (8 mi).
0
Keystone, Thursday, 8 October
Overcast. High 69°, low 34°.
0.09
Keystone, Friday, 9 October
Rain. High 64°, low 35°.
0.05
Keystone, Saturday, 10 October
Snow. High 44°, low 33°.
0.03Keystone, Sunday, 11 October
Light snow. High 37°, low 29°.
0
Keystone, Monday, 12 October
Partly cloudy. High 42°, low 23°.
0.03Keystone, Tuesday, 13 October
Light rain. High 51°, low 26°.
0.15Keystone, Wednesday, 14 October
Snow. High 36°, low 31°.
0.04Keystone, Thursday, 15 October
Light snow. High 39°, low 24°.
0
Keystone, Friday, 16 October
Clear. High 42°, low 17°.
0Keystone, Saturday, 17 October
Mostly clear. High 47°, low 19°.
0Keystone, Sunday, 18 October
Overcast. High 47°, low 27°.
0Keystone, Monday, 19 October
Overcast. High 50°, low 28°.
0Keystone, Tuesday, 20 October
Partly cloudy. High 53°, low 34°.
0Keystone, Wednesday, 21 October
Overcast. High 56°, low 35°.
0Keystone, Thursday, 22 October
Clear. High 53°, low 32°.
0.09
Keystone, Friday, 23 October
Climate normal for this date — 60-year average.
0.07Keystone, Saturday, 24 October
Climate normal for this date — 60-year average.
0.09Keystone, Sunday, 25 October
Climate normal for this date — 60-year average.
0.09Keystone, Monday, 26 October
Climate normal for this date — 60-year average.
0.09Keystone, Tuesday, 27 October
Climate normal for this date — 60-year average.
0.09Keystone, Wednesday, 28 October
Climate normal for this date — 60-year average.
0.1Keystone, Thursday, 29 October
Climate normal for this date — 60-year average.
0.08Keystone, Friday, 30 October
Climate normal for this date — 60-year average.
0.11Keystone, Saturday, 31 October
Climate normal for this date — 60-year average.
0.11Keystone, Sunday, 1 November
Climate normal for this date — 60-year average.
0.12Keystone, Monday, 2 November
Climate normal for this date — 60-year average.
0.06Keystone, Tuesday, 3 November
Climate normal for this date — 60-year average.
0.13Keystone, Wednesday, 4 November
Climate normal for this date — 60-year average.
0.12Keystone, Thursday, 5 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 Keystone, 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 Keystone, 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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