Falmouth, Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7.7 °C (low) to 20.1 °C (high). Annual precipitation averages 1105.7 Millimeters. Falmouth 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 | -3.3 °C | 7.8 °C | 77.72 mm |
| February | -2.5 °C | 9.7 °C | 65.53 mm |
| March | 1.2 °C | 14 °C | 95.76 mm |
| April | 6.4 °C | 20.3 °C | 83.82 mm |
| May | 12 °C | 24.7 °C | 103.12 mm |
| June | 17 °C | 29.3 °C | 103.63 mm |
| July | 19.6 °C | 31.7 °C | 115.57 mm |
| August | 18.3 °C | 30.6 °C | 91.19 mm |
| September | 14.7 °C | 27 °C | 109.98 mm |
| October | 7.8 °C | 21.1 °C | 90.42 mm |
| November | 2 °C | 15.1 °C | 81.53 mm |
| December | -1.4 °C | 9.8 °C | 87.38 mm |
| Annual | 7.7 °C | 20.1 °C | 1105.65 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 |