Idylwood, Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7.9 °C (low) to 18.9 °C (high). Annual precipitation averages 1152.9 Millimeters. Idylwood is located in USDA Plant Hardiness Zone 7b. 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 | -3.4 °C | 6.2 °C | 78.74 mm |
| February | -2.6 °C | 8 °C | 69.09 mm |
| March | 1.1 °C | 12.8 °C | 99.82 mm |
| April | 6.7 °C | 19.4 °C | 86.36 mm |
| May | 12.1 °C | 23.8 °C | 114.05 mm |
| June | 17.1 °C | 28.3 °C | 114.05 mm |
| July | 19.8 °C | 30.7 °C | 116.59 mm |
| August | 18.9 °C | 29.7 °C | 90.68 mm |
| September | 15.2 °C | 26 °C | 113.03 mm |
| October | 8.6 °C | 19.6 °C | 96.77 mm |
| November | 2.8 °C | 13.8 °C | 81.28 mm |
| December | -1.1 °C | 8.3 °C | 92.46 mm |
| Annual | 7.9 °C | 18.9 °C | 1152.92 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 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |