| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F | |
| 2012 Hardiness Zone: | 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: | May 1 - May 10 | |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers | |
| Ecoregion: | 54a - Illinois/Indiana Prairies | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 15 - 30 days Over 86°F |
Annual Climate Data for ZIP Code 61866 - Rantoul, IL | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 14 | 19 | 30 | 39 | 50 | 60 | 64 | 61 | 53 | 42 | 31 | 21 | 40 |
| Avg Max Temp (°F) | 33 | 38 | 50 | 63 | 74 | 84 | 87 | 85 | 79 | 66 | 51 | 38 | 62 |
| Avg Precip (In.) | 1.77 | 1.8 | 3.05 | 3.64 | 4.2 | 3.95 | 4.37 | 4.25 | 2.99 | 2.87 | 3.19 | 2.69 | 38.76 |