Sauget, Illinois has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 46.9 °F (low) to 66.7 °F (high). Annual precipitation averages 44.5 Inches. Sauget 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 Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 23.2 °F | 40.2 °F | 2.71 in. |
| February | 26.8 °F | 45.6 °F | 2.37 in. |
| March | 35.4 °F | 55.5 °F | 3.51 in. |
| April | 46.2 °F | 67.8 °F | 4.64 in. |
| May | 56.8 °F | 76.8 °F | 5.23 in. |
| June | 65.8 °F | 85.6 °F | 4.68 in. |
| July | 69.7 °F | 89.2 °F | 4.29 in. |
| August | 67.7 °F | 87.8 °F | 3.88 in. |
| September | 59.2 °F | 81.1 °F | 3.41 in. |
| October | 47.6 °F | 69.8 °F | 3.35 in. |
| November | 36.6 °F | 55.8 °F | 3.53 in. |
| December | 27.7 °F | 44.6 °F | 2.85 in. |
| Annual | 46.9 °F | 66.7 °F | 44.45 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| 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 |