The official National Weather Service forecast for Hill City — 39.3647°N, 99.8421°W, 24.1 miles from I-70.
| Graham County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 42 | 46 | 57 | 67 | 76 | 88 | 93 | 90 | 83 | 69 | 56 | 45 | 68 |
| Avg low °F | 18 | 20 | 29 | 38 | 48 | 60 | 65 | 63 | 54 | 41 | 29 | 20 | 40 |
| Precip in | 0.4 | 0.6 | 1.3 | 1.9 | 3.4 | 2.9 | 3.1 | 3.0 | 1.8 | 1.7 | 0.8 | 0.6 | 21.5 |
1996–2025 normals for Graham County — the climate division Hill City sits in. All-time county record high 114.1°F (2012-06-28); record low -24.5°F (1989-12-22). Source: NOAA / National Weather Service.