The official National Weather Service forecast for Madison — 44.0061°N, 97.114°W, population 6,169, 20.1 miles from I-29.
| Lake County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 25 | 29 | 42 | 56 | 68 | 79 | 83 | 80 | 74 | 59 | 44 | 29 | 56 |
| Avg low °F | 6 | 9 | 21 | 33 | 45 | 57 | 61 | 59 | 50 | 37 | 23 | 11 | 34 |
| Precip in | 0.6 | 0.7 | 1.3 | 2.6 | 3.6 | 3.9 | 3.1 | 3.2 | 2.8 | 2.2 | 1.0 | 0.9 | 25.9 |
1996–2025 normals for Lake County — the climate division Madison sits in. All-time county record high 104.9°F (1976-07-10); record low -34.0°F (1970-01-19). Source: NOAA / National Weather Service.