Fair Grove, Missouri has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7.2 °C (low) to 19.3 °C (high). Annual precipitation averages 1179.3 Millimeters. 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 | -5.2 °C | 5.9 °C | 63.75 mm |
| February | -3.3 °C | 8.6 °C | 60.45 mm |
| March | 1.3 °C | 13.9 °C | 97.28 mm |
| April | 6.7 °C | 19.6 °C | 119.38 mm |
| May | 12.2 °C | 24 °C | 146.56 mm |
| June | 17.2 °C | 28.7 °C | 117.6 mm |
| July | 19.4 °C | 31.2 °C | 107.19 mm |
| August | 18.5 °C | 30.9 °C | 90.93 mm |
| September | 14.1 °C | 26.9 °C | 116.33 mm |
| October | 7.5 °C | 20.6 °C | 93.73 mm |
| November | 1.6 °C | 13.6 °C | 95.76 mm |
| December | -3.1 °C | 7.7 °C | 70.36 mm |
| Annual | 7.2 °C | 19.3 °C | 1179.32 mm |
| 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 : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |