Greenfield, Missouri has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 45.5 °F (low) to 67.2 °F (high). Annual precipitation averages 46.3 Inches. Greenfield 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 | 42.7 °F | 2.18 in. |
| February | 26.3 °F | 47.8 °F | 2.14 in. |
| March | 34.9 °F | 57.4 °F | 3.52 in. |
| April | 44.2 °F | 67.1 °F | 4.97 in. |
| May | 54.6 °F | 75.4 °F | 6.14 in. |
| June | 63.8 °F | 84.2 °F | 5.04 in. |
| July | 67.9 °F | 89.0 °F | 4.24 in. |
| August | 66.1 °F | 88.6 °F | 3.71 in. |
| September | 57.7 °F | 81.1 °F | 4.59 in. |
| October | 46.0 °F | 69.6 °F | 3.66 in. |
| November | 35.3 °F | 56.8 °F | 3.48 in. |
| December | 26.6 °F | 46.3 °F | 2.67 in. |
| Annual | 45.5 °F | 67.2 °F | 46.34 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 6b : -5°F to 0°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |