The official National Weather Service forecast for Bigfork — 48.0633°N, 114.0726°W, 71.4 miles from I-90.
| Flathead County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 30 | 32 | 41 | 49 | 58 | 66 | 77 | 75 | 65 | 50 | 37 | 29 | 51 |
| Avg low °F | 17 | 16 | 22 | 28 | 36 | 42 | 48 | 46 | 40 | 31 | 24 | 18 | 31 |
| Precip in | 3.9 | 3.3 | 3.3 | 2.8 | 3.0 | 3.5 | 1.2 | 1.4 | 1.9 | 3.0 | 4.0 | 4.2 | 35.5 |
1996–2025 normals for Flathead County — the climate division Bigfork sits in. All-time county record high 95.5°F (2018-08-11); record low -37.3°F (2024-01-14). Source: NOAA / National Weather Service.