| 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: | May 1 - May 10 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 54a - Illinois/Indiana Prairies |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 61068 - Rochelle, IL | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 9 | 16 | 26 | 37 | 48 | 57 | 61 | 59 | 51 | 40 | 29 | 16 | 37 |
| Avg Max Temp (°F) | 26 | 33 | 45 | 59 | 71 | 80 | 83 | 81 | 74 | 63 | 46 | 32 | 58 |
| Avg Precip (In.) | 1.48 | 1.34 | 2.42 | 3.57 | 4.08 | 4.53 | 3.92 | 4.29 | 3.49 | 2.68 | 2.86 | 2.09 | 36.76 |