Penhook, Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7.5 °C (low) to 19.8 °C (high). Annual precipitation averages 1166.1 Millimeters. Penhook is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -3.1 °C | 8.1 °C | 92.96 mm |
| February | -2.1 °C | 10.1 °C | 73.66 mm |
| March | 1.5 °C | 14.7 °C | 100.08 mm |
| April | 6.6 °C | 20.5 °C | 96.77 mm |
| May | 11.8 °C | 24.5 °C | 110.49 mm |
| June | 16.4 °C | 28.3 °C | 111 mm |
| July | 18.9 °C | 30.3 °C | 103.12 mm |
| August | 18.1 °C | 29.4 °C | 91.19 mm |
| September | 14.3 °C | 26 °C | 117.86 mm |
| October | 7.6 °C | 20.7 °C | 89.15 mm |
| November | 1.7 °C | 15.1 °C | 86.11 mm |
| December | -1.4 °C | 9.8 °C | 93.73 mm |
| Annual | 7.5 °C | 19.8 °C | 1166.12 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 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 | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |