| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F 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: | 72d - Upper Mississippi Alluvial Plain | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 15 - 30 days Over 86°F |
Annual Climate Data for ZIP Code 61540 - Lacon, IL | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 14 | 19 | 30 | 40 | 50 | 60 | 64 | 62 | 54 | 42 | 32 | 20 | 41 |
| Avg Max Temp (°F) | 31 | 37 | 50 | 63 | 75 | 83 | 87 | 85 | 78 | 66 | 50 | 36 | 62 |
| Avg Precip (In.) | 1.55 | 1.6 | 2.97 | 3.75 | 4.17 | 4.18 | 4.02 | 3.6 | 3.46 | 2.87 | 3.01 | 2.31 | 37.48 |