| 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: | Apr. 21 - Apr. 30 | |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers | |
| Ecoregion: | 72i - Western Dissected Illinoian Till Plain | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 1 - 7 days Over 86°F |
Annual Climate Data for ZIP Code 61448 - Knoxville, IL | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 13 | 19 | 29 | 40 | 51 | 60 | 65 | 62 | 54 | 42 | 31 | 19 | 40 |
| Avg Max Temp (°F) | 29 | 35 | 48 | 61 | 73 | 82 | 85 | 82 | 76 | 64 | 48 | 34 | 60 |
| Avg Precip (In.) | 1.45 | 1.53 | 2.82 | 3.76 | 4.02 | 4.19 | 4.25 | 3.92 | 3.46 | 2.64 | 2.74 | 2.24 | 37.03 |