Evergreen, Missouri has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 45.3 °F (low) to 66.4 °F (high). Annual precipitation averages 45.4 Inches. Evergreen 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. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 22.8 °F | 42.0 °F | 2.65 in. |
| February | 26.7 °F | 47.2 °F | 2.62 in. |
| March | 34.6 °F | 56.6 °F | 3.77 in. |
| April | 44.6 °F | 67.4 °F | 4.69 in. |
| May | 54.1 °F | 75.3 °F | 5.51 in. |
| June | 62.9 °F | 83.2 °F | 4.31 in. |
| July | 67.0 °F | 87.8 °F | 4.09 in. |
| August | 65.3 °F | 87.3 °F | 3.78 in. |
| September | 56.9 °F | 79.8 °F | 4.21 in. |
| October | 45.6 °F | 68.8 °F | 3.32 in. |
| November | 35.6 °F | 55.9 °F | 3.69 in. |
| December | 27.2 °F | 45.4 °F | 2.73 in. |
| Annual | 45.3 °F | 66.4 °F | 45.37 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 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |