The official National Weather Service forecast for Presho — 43.9097°N, 100.0587°W, 9.2 miles from I-90.
| Lyman County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 31 | 35 | 47 | 59 | 70 | 82 | 89 | 86 | 79 | 63 | 48 | 34 | 60 |
| Avg low °F | 10 | 13 | 23 | 33 | 45 | 56 | 62 | 60 | 51 | 37 | 24 | 14 | 36 |
| Precip in | 0.4 | 0.6 | 1.0 | 2.3 | 3.3 | 3.4 | 2.7 | 2.6 | 2.0 | 1.7 | 0.6 | 0.6 | 21.2 |
1996–2025 normals for Lyman County — the climate division Presho sits in. All-time county record high 110.1°F (1966-07-11); record low -32.6°F (1994-02-09). Source: NOAA / National Weather Service.