| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°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: | 54a - Illinois/Indiana Prairies |
| Heat Zone Days: | 15 - 30 days Over 86°F |
Annual Climate Data for ZIP Code 61880 - Tolono, IL | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 16 | 21 | 31 | 40 | 51 | 61 | 64 | 62 | 54 | 43 | 33 | 22 | 42 |
| Avg Max Temp (°F) | 33 | 39 | 50 | 63 | 75 | 84 | 86 | 84 | 79 | 66 | 51 | 38 | 62 |
| Avg Precip (In.) | 1.99 | 2.01 | 3.15 | 3.69 | 4.45 | 4.11 | 4.55 | 4.15 | 3.09 | 2.82 | 3.44 | 2.81 | 40.27 |