| 2023 Hardiness Zone: | Zone 5b: -15°F to -10°F |
| 2012 Hardiness Zone: | Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 5a: -20F to -15F |
| Average First Frost Date: | Oct. 11 - Oct. 20 |
| Average Last Frost Date: | May 1 - May 10 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 72f - River Hills |
| Heat Zone Days: | 1 - 7 days Over 86°F |
Annual Climate Data for ZIP Code 61240 - Coal Valley, IL | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 12 | 18 | 29 | 39 | 50 | 60 | 65 | 62 | 54 | 42 | 30 | 18 | 40 |
| Avg Max Temp (°F) | 29 | 35 | 48 | 61 | 73 | 82 | 86 | 83 | 76 | 64 | 48 | 34 | 60 |
| Avg Precip (In.) | 1.52 | 1.46 | 2.82 | 3.73 | 4.23 | 4.52 | 4.01 | 4.37 | 3.28 | 2.78 | 2.7 | 2.18 | 37.6 |