The official National Weather Service forecast for Winnett — 47.0028°N, 108.3521°W, 71.1 miles from I-94.
| Petroleum County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 34 | 37 | 48 | 58 | 67 | 77 | 88 | 86 | 76 | 60 | 46 | 36 | 59 |
| Avg low °F | 12 | 14 | 23 | 32 | 41 | 50 | 57 | 55 | 46 | 34 | 23 | 14 | 33 |
| Precip in | 0.4 | 0.5 | 0.6 | 1.4 | 2.7 | 2.7 | 1.3 | 1.2 | 1.2 | 1.1 | 0.5 | 0.5 | 14.1 |
1996–2025 normals for Petroleum County — the climate division Winnett sits in. All-time county record high 111.3°F (2026-07-13); record low -40.6°F (1954-01-20). Source: NOAA / National Weather Service.