Nowmal › Montana › Butte-Silver Bow (balance)
Butte-Silver Bow (balance), Montana
The week’s forecast, measured against two yardsticks: the “normal” your weather app still uses — a 1991–2020 average centered on 2005 — and the climate-adjusted normal, which here runs +1.5°F warmer. Same NOAA data. No pretending.
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Month by month
1991 called. It wants its climate baseline back.
| Month | Normal high | Adjusted high | Normal low | Adjusted low | Gap (high) |
|---|---|---|---|---|---|
| January | 31.5° | 34.3° | 14.3° | 16.6° | +2.8° |
| February | 33.4° | 34.3° | 14.5° | 14.9° | +0.9° |
| March | 41.4° | 44.1° | 20.5° | 22.6° | +2.7° |
| April | 48.0° | 48.8° | 26.1° | 26.4° | +0.8° |
| May | 57.6° | 58.2° | 34.1° | 34.8° | +0.6° |
| June | 65.8° | 67.3° | 40.7° | 41.6° | +1.5° |
| July | 76.6° | 78.4° | 47.0° | 47.8° | +1.7° |
| August | 75.5° | 77.2° | 45.5° | 46.3° | +1.7° |
| September | 65.0° | 67.4° | 38.4° | 39.4° | +2.4° |
| October | 51.0° | 51.7° | 29.1° | 29.3° | +0.7° |
| November | 37.9° | 39.2° | 19.4° | 19.9° | +1.3° |
| December | 30.1° | 31.1° | 13.3° | 13.6° | +1.1° |
The “normal” temperature in every weather app is a 30-year average (1991–2020) — a number centered on mid-2005, two decades out of date in a warming climate. The Climate-Adjusted Normal takes NOAA’s official normal and advances it to the present using this county’s own measured warming trend.
It isn’t a forecast — it’s a more honest yardstick for what “normal” means now. Read why Nowmal exists →
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About this data
The forecast is the National Weather Service’s, for Butte-Silver Bow (balance) itself. Normals and the warming trend are computed at county level (Silver Bow County) from NOAA’s homogenized climate record, because climate trends vary smoothly — nearby towns warm at statistically indistinguishable rates. Method details on the methodology page.
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