The official National Weather Service forecast for Preston — 42.0503°N, 90.414°W, 31.3 miles from I-80.
| Jackson County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 29 | 33 | 47 | 60 | 71 | 81 | 84 | 82 | 76 | 63 | 48 | 34 | 59 |
| Avg low °F | 13 | 16 | 28 | 38 | 49 | 59 | 63 | 61 | 53 | 41 | 30 | 19 | 39 |
| Precip in | 1.3 | 1.6 | 2.2 | 3.7 | 4.5 | 5.3 | 4.7 | 4.0 | 3.2 | 3.1 | 1.9 | 1.9 | 37.4 |
1996–2025 normals for Jackson County — the climate division Preston sits in. All-time county record high 101.3°F (1988-08-18); record low -32.0°F (2009-01-16). Source: NOAA / National Weather Service.