| 2023 Hardiness Zone: | Zone 6b: -5°F to 0°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F |
| Average First Frost Date: | Oct. 11 - Oct. 20 |
| Average Last Frost Date: | Apr. 11 - Apr. 20 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 72j - Southern Illinoian Till Plain |
| Heat Zone Days: | 46 - 60 days Over 86°F |
Annual Climate Data for ZIP Code 62448 - Newton, IL | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 18 | 22 | 32 | 42 | 52 | 62 | 65 | 63 | 55 | 43 | 34 | 24 | 43 |
| Avg Max Temp (°F) | 35 | 41 | 53 | 64 | 75 | 84 | 87 | 86 | 79 | 68 | 53 | 41 | 64 |
| Avg Precip (In.) | 2.4 | 2.4 | 3.8 | 4 | 4.41 | 3.93 | 4.25 | 3.54 | 3.16 | 2.9 | 4.04 | 3.07 | 41.91 |