| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°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: | Apr. 21 - Apr. 30 | |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers | |
| Ecoregion: | 72i - Western Dissected Illinoian Till Plain | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 31 - 45 days Over 86°F |
Annual Climate Data for ZIP Code 61455 - Macomb, IL | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 14 | 19 | 29 | 40 | 51 | 61 | 65 | 63 | 54 | 43 | 31 | 20 | 41 |
| Avg Max Temp (°F) | 32 | 38 | 50 | 62 | 73 | 82 | 86 | 84 | 77 | 66 | 50 | 36 | 61 |
| Avg Precip (In.) | 1.3 | 1.53 | 2.85 | 3.58 | 4.32 | 4.01 | 4.12 | 3.38 | 3.53 | 2.83 | 2.72 | 2.2 | 36.37 |