Water Valley, Kentucky has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.7 °C (low) to 20.6 °C (high). Annual precipitation averages 1346.2 Millimeters. Water Valley is located in USDA Plant Hardiness Zone 7b. 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 | -2.7 °C | 7.3 °C | 101.85 mm |
| February | -1.2 °C | 9.8 °C | 108.71 mm |
| March | 3.3 °C | 15.3 °C | 126.75 mm |
| April | 8.3 °C | 21 °C | 133.1 mm |
| May | 14.2 °C | 25.8 °C | 143.76 mm |
| June | 18.6 °C | 30.1 °C | 109.73 mm |
| July | 20.5 °C | 31.8 °C | 106.17 mm |
| August | 19.1 °C | 31.3 °C | 82.55 mm |
| September | 14.8 °C | 28.3 °C | 95.25 mm |
| October | 8.4 °C | 22.2 °C | 98.55 mm |
| November | 2.7 °C | 14.8 °C | 111.51 mm |
| December | -1.2 °C | 9.2 °C | 128.27 mm |
| Annual | 8.7 °C | 20.6 °C | 1346.2 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 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |