Suffolk, Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.8 °C (low) to 21.6 °C (high). Annual precipitation averages 1305.3 Millimeters. Suffolk is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -0.9 °C | 10.7 °C | 93.98 mm |
| February | -0.1 °C | 12.3 °C | 73.66 mm |
| March | 3.4 °C | 16.1 °C | 102.62 mm |
| April | 8.8 °C | 21.6 °C | 95.25 mm |
| May | 13.8 °C | 25.6 °C | 102.11 mm |
| June | 18.4 °C | 29.7 °C | 119.63 mm |
| July | 20.9 °C | 31.7 °C | 134.87 mm |
| August | 20.1 °C | 30.8 °C | 149.86 mm |
| September | 17.1 °C | 27.9 °C | 140.72 mm |
| October | 10.4 °C | 22.8 °C | 108.2 mm |
| November | 4.3 °C | 17.3 °C | 91.69 mm |
| December | 1 °C | 12.7 °C | 92.71 mm |
| Annual | 9.8 °C | 21.6 °C | 1305.3 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |