Cerro Gordo, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 42.4 °F (low) to 62.5 °F (high). Annual precipitation averages 39.4 Inches. Cerro Gordo is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 18.5 °F | 34.4 °F | 2.26 in. |
| February | 21.3 °F | 39.2 °F | 2.03 in. |
| March | 30.6 °F | 50.5 °F | 2.75 in. |
| April | 41.5 °F | 63.6 °F | 4.2 in. |
| May | 53.0 °F | 73.8 °F | 4.53 in. |
| June | 61.8 °F | 82.7 °F | 4.64 in. |
| July | 64.8 °F | 85.4 °F | 3.89 in. |
| August | 62.7 °F | 83.8 °F | 3.16 in. |
| September | 55.2 °F | 79.0 °F | 3.15 in. |
| October | 43.1 °F | 66.3 °F | 3.31 in. |
| November | 32.3 °F | 51.4 °F | 3.07 in. |
| December | 24.3 °F | 39.3 °F | 2.42 in. |
| Annual | 42.4 °F | 62.5 °F | 39.41 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |