Gainesville, Missouri has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8 °C (low) to 20.7 °C (high). Annual precipitation averages 1180.1 Millimeters. Gainesville 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 Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -3.7 °C | 7.8 °C | 75.95 mm |
| February | -1.9 °C | 10.6 °C | 74.68 mm |
| March | 2.4 °C | 15.4 °C | 113.03 mm |
| April | 7.6 °C | 21.3 °C | 130.3 mm |
| May | 12.8 °C | 25.1 °C | 126.24 mm |
| June | 17.7 °C | 29.7 °C | 94.23 mm |
| July | 19.8 °C | 32.1 °C | 96.01 mm |
| August | 18.8 °C | 31.8 °C | 81.03 mm |
| September | 14.4 °C | 27.9 °C | 100.33 mm |
| October | 7.9 °C | 22 °C | 93.47 mm |
| November | 2.6 °C | 15.2 °C | 111.76 mm |
| December | -1.9 °C | 9.3 °C | 83.06 mm |
| Annual | 8 °C | 20.7 °C | 1180.09 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 7a : -17.8°C to -15°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 |