The official National Weather Service forecast for Beloit — 39.4561°N, 98.1062°W, 40.5 miles from I-70.
| Mitchell County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 40 | 45 | 57 | 67 | 76 | 88 | 92 | 89 | 82 | 69 | 56 | 43 | 67 |
| Avg low °F | 18 | 20 | 31 | 40 | 51 | 62 | 67 | 65 | 56 | 43 | 30 | 21 | 42 |
| Precip in | 0.6 | 0.8 | 1.4 | 2.3 | 4.1 | 3.5 | 3.6 | 3.5 | 2.5 | 1.9 | 1.2 | 0.8 | 26.2 |
1996–2025 normals for Mitchell County — the climate division Beloit sits in. All-time county record high 111.5°F (2012-06-28); record low -27.0°F (1989-12-23). Source: NOAA / National Weather Service.