| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F |
| 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: | 72f - River Hills |
| Heat Zone Days: | 46 - 60 days Over 86°F |
Annual Climate Data for ZIP Code 62363 - Pittsfield, IL | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 16 | 20 | 31 | 42 | 52 | 62 | 66 | 63 | 54 | 43 | 32 | 21 | 42 |
| Avg Max Temp (°F) | 34 | 40 | 52 | 64 | 74 | 82 | 87 | 85 | 78 | 67 | 51 | 38 | 63 |
| Avg Precip (In.) | 1.66 | 1.79 | 3.15 | 3.79 | 4.46 | 3.54 | 3.99 | 3.29 | 3.33 | 2.9 | 3.43 | 2.54 | 37.88 |