Montclair, Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7.8 °C (low) to 19.3 °C (high). Annual precipitation averages 1115.3 Millimeters. Montclair 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 Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -3.7 °C | 6.7 °C | 76.96 mm |
| February | -2.8 °C | 8.7 °C | 67.06 mm |
| March | 0.9 °C | 13.3 °C | 95.5 mm |
| April | 6.7 °C | 19.7 °C | 81.53 mm |
| May | 12.2 °C | 24.1 °C | 104.14 mm |
| June | 17.2 °C | 28.7 °C | 108.46 mm |
| July | 19.9 °C | 31.1 °C | 112.27 mm |
| August | 18.8 °C | 30.1 °C | 93.22 mm |
| September | 15.1 °C | 26.3 °C | 109.47 mm |
| October | 8.2 °C | 20.1 °C | 93.98 mm |
| November | 2.1 °C | 14.1 °C | 82.55 mm |
| December | -1.4 °C | 8.9 °C | 90.17 mm |
| Annual | 7.8 °C | 19.3 °C | 1115.31 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| 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 |