The official National Weather Service forecast for Coalmont — 39.1934°N, 87.2311°W, 16.8 miles from I-70. Forecasts here are written by NWS IND, this county’s forecast office.
| Clay County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 37 | 42 | 53 | 65 | 75 | 83 | 86 | 85 | 80 | 67 | 53 | 42 | 64 |
| Avg low °F | 20 | 24 | 32 | 42 | 52 | 61 | 65 | 63 | 55 | 44 | 33 | 26 | 43 |
| Precip in | 3.1 | 2.7 | 3.7 | 4.9 | 4.8 | 5.4 | 4.5 | 3.0 | 3.1 | 3.6 | 3.1 | 3.2 | 45.1 |
1996–2025 normals for Clay County — the climate division Coalmont sits in. All-time county record high 105.4°F (2012-07-08); record low -24.8°F (1994-01-19). Source: NOAA / National Weather Service.