New Baden, Illinois has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 46.1 °F (low) to 66 °F (high). Annual precipitation averages 41.9 Inches. New Baden is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 22.6 °F | 39.6 °F | 2.72 in. |
| February | 26.0 °F | 44.8 °F | 2.28 in. |
| March | 34.7 °F | 55.1 °F | 3.23 in. |
| April | 45.4 °F | 67.0 °F | 4.73 in. |
| May | 56.3 °F | 76.1 °F | 4.82 in. |
| June | 65.2 °F | 85.0 °F | 4.71 in. |
| July | 68.8 °F | 88.4 °F | 3.8 in. |
| August | 66.7 °F | 87.3 °F | 3.07 in. |
| September | 58.3 °F | 80.8 °F | 3.2 in. |
| October | 46.5 °F | 69.4 °F | 2.99 in. |
| November | 35.7 °F | 55.1 °F | 3.67 in. |
| December | 27.1 °F | 43.9 °F | 2.72 in. |
| Annual | 46.1 °F | 66 °F | 41.94 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |