Fair Grove, Missouri has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 45 °F (low) to 66.7 °F (high). Annual precipitation averages 46.4 Inches. Fair Grove 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 | 22.6 °F | 42.6 °F | 2.51 in. |
| February | 26.1 °F | 47.5 °F | 2.38 in. |
| March | 34.4 °F | 57.1 °F | 3.83 in. |
| April | 44.0 °F | 67.2 °F | 4.7 in. |
| May | 54.0 °F | 75.2 °F | 5.77 in. |
| June | 62.9 °F | 83.6 °F | 4.63 in. |
| July | 67.0 °F | 88.2 °F | 4.22 in. |
| August | 65.3 °F | 87.6 °F | 3.58 in. |
| September | 57.3 °F | 80.4 °F | 4.58 in. |
| October | 45.5 °F | 69.1 °F | 3.69 in. |
| November | 34.9 °F | 56.4 °F | 3.77 in. |
| December | 26.5 °F | 45.9 °F | 2.77 in. |
| Annual | 45 °F | 66.7 °F | 46.43 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 |