Henlawson, West Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 6.9 °C (low) to 20 °C (high). Annual precipitation averages 1246.4 Millimeters. Henlawson is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.2 °C | 7 °C | 85.85 mm |
| February | -2.8 °C | 9.4 °C | 87.38 mm |
| March | 0.6 °C | 14.4 °C | 114.3 mm |
| April | 5.8 °C | 21.4 °C | 105.92 mm |
| May | 11.3 °C | 25.5 °C | 130.56 mm |
| June | 16.1 °C | 29.3 °C | 125.22 mm |
| July | 18.3 °C | 31 °C | 154.69 mm |
| August | 17.7 °C | 30.4 °C | 98.3 mm |
| September | 13.8 °C | 27.4 °C | 85.34 mm |
| October | 6.8 °C | 21.1 °C | 78.74 mm |
| November | 1 °C | 14.6 °C | 74.42 mm |
| December | -1.9 °C | 8.9 °C | 105.66 mm |
| Annual | 6.9 °C | 20 °C | 1246.38 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |