The official National Weather Service forecast for Winner — 43.3767°N, 99.859°W, 34.7 miles from I-90.
| Tripp County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 33 | 37 | 48 | 59 | 70 | 81 | 89 | 86 | 79 | 63 | 49 | 36 | 61 |
| Avg low °F | 12 | 14 | 24 | 33 | 45 | 56 | 62 | 60 | 51 | 37 | 25 | 15 | 36 |
| Precip in | 0.4 | 0.5 | 1.0 | 2.5 | 3.5 | 3.6 | 2.5 | 2.6 | 2.0 | 1.7 | 0.6 | 0.6 | 21.5 |
1996–2025 normals for Tripp County — the climate division Winner sits in. All-time county record high 110.0°F (2012-08-30); record low -28.7°F (1966-01-29). Source: NOAA / National Weather Service.