Columbia, Illinois has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 47.1 °F (low) to 66.6 °F (high). Annual precipitation averages 44.4 Inches. Columbia is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 23.5 °F | 40.3 °F | 2.76 in. |
| February | 26.9 °F | 45.8 °F | 2.45 in. |
| March | 35.6 °F | 55.8 °F | 3.61 in. |
| April | 46.3 °F | 67.9 °F | 4.85 in. |
| May | 57.0 °F | 76.8 °F | 5.16 in. |
| June | 65.9 °F | 85.6 °F | 4.69 in. |
| July | 69.8 °F | 88.9 °F | 4.15 in. |
| August | 67.7 °F | 87.6 °F | 3.54 in. |
| September | 59.5 °F | 81.0 °F | 3.35 in. |
| October | 48.0 °F | 69.6 °F | 3.27 in. |
| November | 36.7 °F | 55.7 °F | 3.64 in. |
| December | 28.0 °F | 44.7 °F | 2.89 in. |
| Annual | 47.1 °F | 66.6 °F | 44.36 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |