| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F | |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F | |
| 1990 Hardiness Zone: | Zone 5a: -20F to -15F | |
| Average First Frost Date: | Oct. 1 - Oct. 10 | |
| Average Last Frost Date: | May 1 - May 10 | |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers | |
| Ecoregion: | 52a - Savanna Section | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 61001 - Apple River, IL | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 8 | 14 | 25 | 36 | 47 | 56 | 61 | 58 | 50 | 38 | 27 | 14 | 36 |
| Avg Max Temp (°F) | 26 | 32 | 44 | 58 | 70 | 79 | 82 | 80 | 73 | 61 | 44 | 31 | 57 |
| Avg Precip (In.) | 1.21 | 1.32 | 2.3 | 3.46 | 3.79 | 4.55 | 3.78 | 4.36 | 3.62 | 2.54 | 2.56 | 1.63 | 35.1 |