| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 5b: -15°F to -10°F | |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°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: | 54g - Rock River Hills | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 61032 - Freeport, IL | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 9 | 15 | 26 | 37 | 48 | 58 | 62 | 59 | 51 | 40 | 28 | 16 | 37 |
| Avg Max Temp (°F) | 26 | 32 | 44 | 58 | 70 | 79 | 82 | 80 | 73 | 62 | 45 | 31 | 57 |
| Avg Precip (In.) | 1.31 | 1.31 | 2.18 | 3.3 | 3.93 | 4.44 | 3.63 | 4.16 | 3.6 | 2.58 | 2.66 | 1.72 | 34.82 |