Weather in Tattnall, MT
Tattnall, Sunday, 18 October, 12:27
Overcast. Feels like 51°. High 57°, low 37°.
Monthly outlook for Tattnall, MT: average high 48.3°, average low 35.7°. That is 1.8° below the climate normal for October. Precipitation is expected on 5 days (about 1.5 inches), against a normal of 2 days and 0.4 inches. The warmest day looks like 22 October (66.2°), the coolest 31 October (27.9°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 18 October – 27 October | 54.9° | 54° | +0.5° |
| 28 October – 6 November | 37.3° | 46.8° | -5.3° |
| 7 November – 16 November | at normal | 40.9° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Valleytown (15 mi).
0Tattnall, Monday, 19 October
Overcast. High 63°, low 35°.
0Tattnall, Tuesday, 20 October
Overcast. High 61°, low 40°.
0
Tattnall, Wednesday, 21 October
Clear. High 59°, low 38°.
0Tattnall, Thursday, 22 October
Clear. High 66°, low 46°.
0.22
Tattnall, Friday, 23 October
Light rain. High 60°, low 42°.
0
Tattnall, Saturday, 24 October
Mostly clear. High 45°, low 35°.
0Tattnall, Sunday, 25 October
Overcast. High 47°, low 39°.
0Tattnall, Monday, 26 October
Overcast. High 48°, low 37°.
0.14Tattnall, Tuesday, 27 October
Light rain. High 45°, low 38°.
0.99
Tattnall, Wednesday, 28 October
Snow. High 42°, low 35°.
0.06Tattnall, Thursday, 29 October
Light snow. High 36°, low 31°.
0Tattnall, Friday, 30 October
Overcast. High 34°, low 28°.
0
Tattnall, Saturday, 31 October
Partly cloudy. High 39°, low 28°.
0Tattnall, Sunday, 1 November
Overcast. High 37°, low 30°.
0.15Tattnall, Monday, 2 November
Snow. High 35°, low 31°.
0.02Tattnall, Tuesday, 3 November
Climate normal for this date — 60-year average.
0.02Tattnall, Wednesday, 4 November
Climate normal for this date — 60-year average.
0.02Tattnall, Thursday, 5 November
Climate normal for this date — 60-year average.
0.02Tattnall, Friday, 6 November
Climate normal for this date — 60-year average.
0.01Tattnall, Saturday, 7 November
Climate normal for this date — 60-year average.
0.04Tattnall, Sunday, 8 November
Climate normal for this date — 60-year average.
0.04Tattnall, Monday, 9 November
Climate normal for this date — 60-year average.
0.02Tattnall, Tuesday, 10 November
Climate normal for this date — 60-year average.
0.02Tattnall, Wednesday, 11 November
Climate normal for this date — 60-year average.
0.03Tattnall, Thursday, 12 November
Climate normal for this date — 60-year average.
0.02Tattnall, Friday, 13 November
Climate normal for this date — 60-year average.
0.02Tattnall, Saturday, 14 November
Climate normal for this date — 60-year average.
0.01Tattnall, Sunday, 15 November
Climate normal for this date — 60-year average.
0.02Tattnall, 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 Tattnall, 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 Tattnall, 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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