| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F | |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F | |
| 1990 Hardiness Zone: | Zone 4b: -25F to -20F | |
| Average First Frost Date: | Oct. 1 - Oct. 10 | |
| Average Last Frost Date: | May 11 - May 20 | |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year | |
| Ecoregion: | 54g - Rock River Hills | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 61053 - Mount Carroll, IL | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 8 | 13 | 25 | 35 | 46 | 55 | 60 | 57 | 48 | 37 | 27 | 14 | 36 |
| Avg Max Temp (°F) | 28 | 34 | 46 | 60 | 72 | 81 | 85 | 83 | 75 | 63 | 47 | 33 | 59 |
| Avg Precip (In.) | 1.41 | 1.48 | 2.57 | 3.61 | 4.27 | 4.69 | 3.8 | 4.49 | 3.42 | 2.7 | 2.78 | 1.99 | 37.21 |