The official National Weather Service forecast for Philipsburg — 46.3321°N, 113.2942°W, 22.9 miles from I-90.
| Granite County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 31 | 33 | 41 | 48 | 57 | 65 | 77 | 75 | 65 | 50 | 37 | 30 | 51 |
| Avg low °F | 16 | 15 | 21 | 26 | 33 | 40 | 46 | 45 | 38 | 29 | 21 | 15 | 29 |
| Precip in | 2.0 | 2.1 | 1.9 | 2.2 | 2.8 | 2.8 | 1.0 | 1.1 | 1.4 | 1.8 | 2.0 | 2.3 | 23.4 |
1996–2025 normals for Granite County — the climate division Philipsburg sits in. All-time county record high 92.2°F (2002-07-13); record low -35.4°F (1989-02-04). Source: NOAA / National Weather Service.