The official National Weather Service forecast for Sheridan — 44.7972°N, 106.9562°W, population 19,430, 1.7 miles from I-90.
| Sheridan County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 34 | 35 | 45 | 53 | 62 | 73 | 83 | 81 | 72 | 56 | 44 | 34 | 56 |
| Avg low °F | 12 | 13 | 21 | 28 | 38 | 47 | 54 | 52 | 43 | 31 | 21 | 13 | 31 |
| Precip in | 0.8 | 0.9 | 1.4 | 2.2 | 3.2 | 2.2 | 1.3 | 1.0 | 1.5 | 1.9 | 0.8 | 0.9 | 18.1 |
1996–2025 normals for Sheridan County — the climate division Sheridan sits in. All-time county record high 101.9°F (2026-07-13); record low -38.8°F (1983-12-24). Source: NOAA / National Weather Service.