The official National Weather Service forecast for Deer Lodge — 46.3958°N, 112.73°W, 0.6 miles from I-90.
| Powell County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 31 | 33 | 42 | 49 | 58 | 67 | 78 | 76 | 66 | 51 | 38 | 31 | 52 |
| Avg low °F | 15 | 14 | 21 | 26 | 34 | 41 | 47 | 45 | 39 | 29 | 21 | 15 | 29 |
| Precip in | 2.5 | 2.4 | 2.2 | 2.2 | 2.8 | 2.8 | 1.0 | 1.2 | 1.5 | 2.1 | 2.3 | 2.7 | 25.7 |
1996–2025 normals for Powell County — the climate division Deer Lodge sits in. All-time county record high 94.5°F (2002-07-13); record low -40.3°F (2024-01-14). Source: NOAA / National Weather Service.