| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 5b: -15°F to -10°F |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F 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: | Apr. 21 - Apr. 30 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 72d - Upper Mississippi Alluvial Plain |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 61252 - Fulton, IL | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 11 | 16 | 27 | 39 | 50 | 60 | 64 | 62 | 53 | 42 | 30 | 18 | 39 |
| Avg Max Temp (°F) | 28 | 34 | 46 | 59 | 71 | 80 | 84 | 82 | 75 | 63 | 47 | 33 | 58 |
| Avg Precip (In.) | 1.36 | 1.29 | 2.4 | 3.42 | 3.97 | 4.43 | 3.48 | 4.52 | 3.12 | 2.67 | 2.56 | 1.83 | 35.02 |