| 2023 Hardiness Zone: | Zone 7b: 5°F to 10°F Zone 7a: 0°F to 5°F |
| 2012 Hardiness Zone: | Zone 6b: -5°F to 0°F Zone 7a: 0°F to 5°F |
| 1990 Hardiness Zone: | Zone 6b: -5F to 0F |
| Average First Frost Date: | Oct. 21 - Oct. 31 |
| Average Last Frost Date: | Apr. 1 - Apr. 10 |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate |
| Ecoregion: | 73a - Northern Holocene Meander Belts |
| Heat Zone Days: | 61 - 90 days Over 86°F |
Annual Climate Data for ZIP Code 62914 - Cairo, IL | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 26 | 30 | 39 | 49 | 59 | 67 | 71 | 68 | 61 | 49 | 39 | 30 | 49 |
| Avg Max Temp (°F) | 41 | 48 | 58 | 69 | 78 | 87 | 90 | 88 | 81 | 71 | 57 | 46 | 68 |
| Avg Precip (In.) | 3.39 | 3.81 | 4.7 | 4.81 | 4.85 | 4.1 | 4.27 | 3.14 | 3.16 | 3.27 | 4.59 | 4.45 | 48.52 |