The official National Weather Service forecast for Ackley — 42.5541°N, 93.0533°W, 23.1 miles from I-35.
| Hardin County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 27 | 31 | 45 | 59 | 71 | 81 | 83 | 81 | 76 | 62 | 47 | 32 | 58 |
| Avg low °F | 10 | 14 | 26 | 37 | 48 | 59 | 62 | 59 | 52 | 39 | 27 | 16 | 37 |
| Precip in | 0.9 | 1.1 | 1.9 | 3.6 | 5.0 | 5.6 | 4.2 | 4.0 | 3.0 | 2.8 | 1.6 | 1.4 | 35.1 |
1996–2025 normals for Hardin County — the climate division Ackley sits in. All-time county record high 103.8°F (1988-08-16); record low -29.8°F (1996-02-03). Source: NOAA / National Weather Service.