Montross, Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 47.9 °F (low) to 68.7 °F (high). Annual precipitation averages 45.7 Inches. Montross 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 | 28.0 °F | 46.8 °F | 3.18 in. |
| February | 29.3 °F | 49.6 °F | 2.75 in. |
| March | 36.0 °F | 57.9 °F | 3.82 in. |
| April | 45.6 °F | 69.3 °F | 3.3 in. |
| May | 55.2 °F | 77.1 °F | 4.06 in. |
| June | 64.1 °F | 85.0 °F | 4.44 in. |
| July | 68.8 °F | 89.1 °F | 4.56 in. |
| August | 67.1 °F | 87.1 °F | 4.49 in. |
| September | 60.8 °F | 81.2 °F | 4.28 in. |
| October | 49.4 °F | 70.8 °F | 4.05 in. |
| November | 38.8 °F | 59.8 °F | 3.26 in. |
| December | 32.1 °F | 50.5 °F | 3.55 in. |
| Annual | 47.9 °F | 68.7 °F | 45.74 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 7b : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7b : 5°F to 10°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |