The official National Weather Service forecast for Chester — 48.5105°N, 110.9675°W, 40.9 miles from I-15.
| Liberty County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 30 | 32 | 43 | 55 | 65 | 73 | 84 | 82 | 71 | 57 | 42 | 32 | 56 |
| Avg low °F | 8 | 9 | 18 | 28 | 38 | 46 | 52 | 50 | 42 | 30 | 19 | 10 | 29 |
| Precip in | 0.5 | 0.5 | 0.5 | 1.1 | 1.8 | 2.5 | 0.9 | 1.2 | 1.2 | 0.8 | 0.6 | 0.5 | 12.1 |
1996–2025 normals for Liberty County — the climate division Chester sits in. All-time county record high 108.1°F (1961-08-06); record low -47.9°F (1968-12-30). Source: NOAA / National Weather Service.