| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F |
| Average First Frost Date: | Oct. 11 - Oct. 20 |
| Average Last Frost Date: | Apr. 11 - Apr. 20 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 72i - Western Dissected Illinoian Till Plain |
| Heat Zone Days: | 46 - 60 days Over 86°F |
Annual Climate Data for ZIP Code 62694 - Winchester, IL | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 16 | 21 | 31 | 42 | 52 | 61 | 65 | 63 | 54 | 43 | 32 | 22 | 42 |
| Avg Max Temp (°F) | 34 | 40 | 52 | 64 | 74 | 83 | 87 | 85 | 79 | 68 | 52 | 39 | 63 |
| Avg Precip (In.) | 1.56 | 1.78 | 3.17 | 3.73 | 4.5 | 3.77 | 3.82 | 3.23 | 3.26 | 2.82 | 3.33 | 2.55 | 37.52 |