The official National Weather Service forecast for Belle Plaine — 41.8969°N, 92.2782°W, 13.9 miles from I-80.
| Benton County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 28 | 32 | 47 | 60 | 71 | 81 | 84 | 82 | 76 | 63 | 47 | 33 | 59 |
| Avg low °F | 11 | 14 | 26 | 37 | 49 | 59 | 63 | 60 | 52 | 40 | 28 | 17 | 38 |
| Precip in | 1.1 | 1.2 | 2.0 | 3.5 | 4.6 | 5.3 | 4.0 | 4.0 | 3.2 | 3.1 | 1.8 | 1.5 | 35.3 |
1996–2025 normals for Benton County — the climate division Belle Plaine sits in. All-time county record high 103.4°F (2012-07-26); record low -32.5°F (2019-01-31). Source: NOAA / National Weather Service.