| 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: | May 1 - May 10 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 54a - Illinois/Indiana Prairies |
| Heat Zone Days: | 15 - 30 days Over 86°F |
Annual Climate Data for ZIP Code 61764 - Pontiac, IL | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 14 | 18 | 29 | 39 | 50 | 60 | 64 | 62 | 53 | 42 | 31 | 20 | 40 |
| Avg Max Temp (°F) | 30 | 36 | 48 | 62 | 73 | 82 | 85 | 83 | 77 | 65 | 49 | 36 | 61 |
| Avg Precip (In.) | 1.62 | 1.49 | 2.82 | 3.43 | 3.9 | 4.09 | 4.03 | 3.56 | 3.09 | 2.69 | 3 | 2.5 | 36.23 |