Montvale, Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7.6 °C (low) to 19.7 °C (high). Annual precipitation averages 1188.7 Millimeters. Montvale 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 | -3 °C | 7.8 °C | 89.66 mm |
| February | -2.1 °C | 9.9 °C | 74.68 mm |
| March | 1.5 °C | 14.6 °C | 96.77 mm |
| April | 6.7 °C | 20.6 °C | 105.41 mm |
| May | 11.9 °C | 24.6 °C | 117.09 mm |
| June | 16.4 °C | 28.3 °C | 119.89 mm |
| July | 18.8 °C | 30.3 °C | 109.22 mm |
| August | 18 °C | 29.5 °C | 88.9 mm |
| September | 14.3 °C | 26.1 °C | 117.35 mm |
| October | 7.7 °C | 20.6 °C | 89.92 mm |
| November | 1.8 °C | 14.9 °C | 85.34 mm |
| December | -1.3 °C | 9.6 °C | 94.49 mm |
| Annual | 7.6 °C | 19.7 °C | 1188.72 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 | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |