Chatmoss, Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7.5 °C (low) to 20.5 °C (high). Annual precipitation averages 1190.8 Millimeters. Chatmoss is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -3.1 °C | 9 °C | 95.5 mm |
| February | -2.1 °C | 11.1 °C | 74.17 mm |
| March | 1.6 °C | 15.5 °C | 104.39 mm |
| April | 6.6 °C | 21.2 °C | 92.46 mm |
| May | 11.8 °C | 25.1 °C | 112.01 mm |
| June | 16.5 °C | 29.1 °C | 113.79 mm |
| July | 19 °C | 31 °C | 104.39 mm |
| August | 18.2 °C | 30.1 °C | 104.65 mm |
| September | 14.4 °C | 26.6 °C | 130.56 mm |
| October | 7.4 °C | 21.5 °C | 89.41 mm |
| November | 1.4 °C | 15.7 °C | 79.25 mm |
| December | -1.6 °C | 10.6 °C | 90.17 mm |
| Annual | 7.5 °C | 20.5 °C | 1190.75 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 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 | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |