| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 5b: -15°F to -10°F |
| 2012 Hardiness Zone: | Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 5a: -20F to -15F |
| Average First Frost Date: | October 11 - 20 |
| Average Last Frost Date: | April 21 - 30 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 54a - Illinois/Indiana Prairies |
| Heat Zone Days: | 1 - 7 days Over 86°F |
Annual Climate Data for ZIP Code 60914 - Bourbonnais, IL | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 13 | 18 | 28 | 38 | 49 | 59 | 63 | 60 | 53 | 41 | 31 | 20 | 40 |
| Avg Max Temp (°F) | 31 | 37 | 48 | 61 | 73 | 83 | 85 | 83 | 78 | 66 | 49 | 36 | 61 |
| Avg Precip (In.) | 1.63 | 1.55 | 2.73 | 3.81 | 4.39 | 4.78 | 4.02 | 3.75 | 3.27 | 3.08 | 3.42 | 2.53 | 38.96 |