The official National Weather Service forecast for Leon — 40.7397°N, 93.7477°W, 6 miles from I-35.
| Decatur County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 33 | 38 | 51 | 63 | 72 | 82 | 86 | 84 | 78 | 65 | 51 | 38 | 62 |
| Avg low °F | 14 | 18 | 29 | 40 | 51 | 61 | 65 | 62 | 54 | 42 | 30 | 20 | 40 |
| Precip in | 1.1 | 1.3 | 2.2 | 3.6 | 5.2 | 5.0 | 3.9 | 4.3 | 3.3 | 3.2 | 1.9 | 1.5 | 36.5 |
1996–2025 normals for Decatur County — the climate division Leon sits in. All-time county record high 104.8°F (1980-07-31); record low -26.8°F (1996-02-03). Source: NOAA / National Weather Service.