The official National Weather Service forecast for Saint Francis — 39.7722°N, 101.7999°W, 33.3 miles from I-70.
| Cheyenne County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 43 | 45 | 56 | 65 | 74 | 86 | 92 | 89 | 82 | 68 | 55 | 45 | 67 |
| Avg low °F | 17 | 19 | 28 | 35 | 46 | 57 | 63 | 61 | 51 | 38 | 27 | 18 | 38 |
| Precip in | 0.3 | 0.5 | 0.9 | 1.7 | 2.8 | 2.6 | 2.9 | 2.6 | 1.5 | 1.2 | 0.5 | 0.4 | 17.9 |
1996–2025 normals for Cheyenne County — the climate division Saint Francis sits in. All-time county record high 110.4°F (2012-06-27); record low -28.9°F (1989-12-22). Source: NOAA / National Weather Service.