| 2023 Hardiness Zone: | 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: | 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: | 1 - 7 days Over 86°F |
Annual Climate Data for ZIP Code 60560 - Yorkville, IL | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 12 | 17 | 27 | 37 | 48 | 58 | 62 | 60 | 52 | 40 | 30 | 18 | 38 |
| Avg Max Temp (°F) | 29 | 35 | 47 | 60 | 72 | 81 | 85 | 82 | 76 | 64 | 48 | 34 | 59 |
| Avg Precip (In.) | 1.66 | 1.52 | 2.59 | 3.69 | 4.01 | 4.34 | 4.03 | 4 | 3.37 | 2.68 | 3.08 | 2.35 | 37.32 |