The official National Weather Service forecast for Monticello — 33.3049°N, 83.6832°W, 20.7 miles from I-20. Forecasts here are written by NWS FFC, this county’s forecast office.
| Jasper County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 57 | 61 | 69 | 76 | 83 | 89 | 92 | 90 | 85 | 77 | 67 | 59 | 75 |
| Avg low °F | 33 | 36 | 42 | 48 | 57 | 66 | 69 | 69 | 62 | 51 | 41 | 35 | 51 |
| Precip in | 4.4 | 4.4 | 4.7 | 4.0 | 3.3 | 4.1 | 4.3 | 4.5 | 4.0 | 2.8 | 3.1 | 4.5 | 48.1 |
1996–2025 normals for Jasper County — the climate division Monticello sits in. All-time county record high 107.1°F (2012-07-01); record low -6.0°F (1985-01-21). Source: NOAA / National Weather Service.