The official National Weather Service forecast for Yorkville — 36.0995°N, 89.119°W, 12.9 miles from I-155.
| Gibson County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 47 | 52 | 62 | 71 | 79 | 87 | 90 | 89 | 84 | 73 | 61 | 51 | 70 |
| Avg low °F | 29 | 33 | 40 | 48 | 58 | 66 | 70 | 67 | 60 | 48 | 39 | 32 | 49 |
| Precip in | 4.4 | 4.9 | 5.5 | 5.5 | 5.8 | 4.3 | 4.1 | 3.8 | 3.6 | 3.7 | 4.3 | 5.0 | 54.9 |
1996–2025 normals for Gibson County — the climate division Yorkville sits in. All-time county record high 104.8°F (2007-08-17); record low -17.3°F (1951-02-02). Source: NOAA / National Weather Service.