The official National Weather Service forecast for Farmersburg — 39.2486°N, 87.382°W, 12.7 miles from I-70. Forecasts here are written by NWS IND, this county’s forecast office.
| Sullivan County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 38 | 43 | 54 | 66 | 76 | 84 | 87 | 86 | 81 | 68 | 54 | 43 | 65 |
| Avg low °F | 22 | 25 | 34 | 43 | 54 | 63 | 66 | 64 | 56 | 45 | 35 | 27 | 44 |
| Precip in | 3.1 | 2.6 | 3.7 | 5.0 | 5.0 | 5.2 | 4.5 | 3.0 | 3.1 | 3.7 | 3.2 | 3.2 | 45.3 |
1996–2025 normals for Sullivan County — the climate division Farmersburg sits in. All-time county record high 105.9°F (2012-06-29); record low -23.1°F (1994-01-19). Source: NOAA / National Weather Service.