The official National Weather Service forecast for Choteau — 47.8124°N, 112.1836°W, 22.2 miles from I-15.
| Teton County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 35 | 35 | 43 | 52 | 61 | 69 | 80 | 79 | 69 | 55 | 42 | 34 | 54 |
| Avg low °F | 14 | 13 | 21 | 28 | 36 | 44 | 49 | 47 | 41 | 31 | 22 | 15 | 30 |
| Precip in | 0.9 | 1.1 | 1.0 | 1.6 | 2.5 | 2.7 | 1.0 | 1.2 | 1.4 | 1.2 | 1.0 | 1.0 | 16.6 |
1996–2025 normals for Teton County — the climate division Choteau sits in. All-time county record high 100.0°F (1969-08-25); record low -41.0°F (1983-12-25). Source: NOAA / National Weather Service.