Mechanicsville, Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.5 °C (low) to 20.7 °C (high). Annual precipitation averages 1179.1 Millimeters. Mechanicsville 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 | -2.5 °C | 8.9 °C | 84.58 mm |
| February | -1.7 °C | 10.7 °C | 71.63 mm |
| March | 1.9 °C | 15.1 °C | 106.43 mm |
| April | 7.4 °C | 21.1 °C | 86.36 mm |
| May | 12.9 °C | 25.2 °C | 103.38 mm |
| June | 17.8 °C | 29.4 °C | 110.49 mm |
| July | 20.1 °C | 31.7 °C | 114.05 mm |
| August | 19.3 °C | 30.7 °C | 120.4 mm |
| September | 15.8 °C | 27.3 °C | 114.81 mm |
| October | 8.9 °C | 21.5 °C | 90.93 mm |
| November | 2.8 °C | 15.8 °C | 83.06 mm |
| December | -0.7 °C | 10.7 °C | 92.96 mm |
| Annual | 8.5 °C | 20.7 °C | 1179.08 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 |