| 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 | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 60511 - Big Rock, IL | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 11 | 17 | 27 | 37 | 48 | 58 | 62 | 60 | 52 | 40 | 29 | 18 | 38 |
| Avg Max Temp (°F) | 29 | 34 | 46 | 59 | 71 | 81 | 84 | 82 | 75 | 63 | 47 | 34 | 59 |
| Avg Precip (In.) | 1.64 | 1.48 | 2.53 | 3.7 | 4.01 | 4.38 | 4.08 | 4.16 | 3.45 | 2.67 | 3.04 | 2.3 | 37.44 |