| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F | |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F | |
| 1990 Hardiness Zone: | Zone 5a: -20F to -15F | |
| Average First Frost Date: | Oct. 1 - Oct. 10 | |
| Average Last Frost Date: | May 1 - May 10 | |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year | |
| Ecoregion: | 54g - Rock River Hills | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 61085 - Stockton, IL | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 9 | 15 | 26 | 36 | 48 | 57 | 61 | 59 | 50 | 39 | 28 | 15 | 37 |
| Avg Max Temp (°F) | 26 | 32 | 44 | 58 | 70 | 79 | 82 | 80 | 73 | 61 | 45 | 31 | 57 |
| Avg Precip (In.) | 1.24 | 1.42 | 2.39 | 3.5 | 3.81 | 4.56 | 3.32 | 4.39 | 3.65 | 2.7 | 2.69 | 1.67 | 35.35 |