| 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: | 54a - Illinois/Indiana Prairies |
| Heat Zone Days: | 1 - 7 days Over 86°F |
Annual Climate Data for ZIP Code 60950 - Manteno, IL | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 14 | 19 | 28 | 38 | 49 | 59 | 63 | 60 | 53 | 41 | 31 | 20 | 40 |
| Avg Max Temp (°F) | 31 | 37 | 48 | 61 | 73 | 82 | 85 | 83 | 77 | 65 | 49 | 36 | 61 |
| Avg Precip (In.) | 1.62 | 1.52 | 2.69 | 3.89 | 4.5 | 4.93 | 4.05 | 3.75 | 3.3 | 3.2 | 3.51 | 2.53 | 39.47 |