Onancock, Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 50.6 °F (low) to 67.2 °F (high). Annual precipitation averages 47 Inches. Onancock 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 | 31.0 °F | 47.2 °F | 3.41 in. |
| February | 32.0 °F | 49.1 °F | 3.03 in. |
| March | 38.2 °F | 55.2 °F | 4.08 in. |
| April | 47.8 °F | 65.6 °F | 3.41 in. |
| May | 57.4 °F | 74.3 °F | 3.61 in. |
| June | 66.3 °F | 82.7 °F | 4.13 in. |
| July | 71.3 °F | 87.0 °F | 4.61 in. |
| August | 69.3 °F | 84.9 °F | 4.67 in. |
| September | 63.8 °F | 79.8 °F | 4.14 in. |
| October | 52.7 °F | 69.9 °F | 4.49 in. |
| November | 42.2 °F | 59.3 °F | 3.5 in. |
| December | 35.3 °F | 51.4 °F | 3.87 in. |
| Annual | 50.6 °F | 67.2 °F | 46.95 in. |
| 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 : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |