Gibson City, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 41 °F (low) to 61.4 °F (high). Annual precipitation averages 38.4 Inches. Gibson City 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 | 16.6 °F | 32.8 °F | 2.11 in. |
| February | 19.9 °F | 37.3 °F | 1.82 in. |
| March | 29.1 °F | 49.1 °F | 2.59 in. |
| April | 39.6 °F | 62.4 °F | 3.8 in. |
| May | 51.5 °F | 73.5 °F | 4.58 in. |
| June | 60.7 °F | 82.0 °F | 4.36 in. |
| July | 63.6 °F | 84.6 °F | 4.0 in. |
| August | 61.2 °F | 83.1 °F | 3.66 in. |
| September | 53.6 °F | 78.3 °F | 3.18 in. |
| October | 41.9 °F | 65.4 °F | 3.26 in. |
| November | 31.5 °F | 50.4 °F | 2.78 in. |
| December | 22.2 °F | 37.7 °F | 2.24 in. |
| Annual | 41 °F | 61.4 °F | 38.38 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 125-150 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 |