Oceana, West Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 6 °C (low) to 18.5 °C (high). Annual precipitation averages 1270.8 Millimeters. Oceana is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.8 °C | 5.8 °C | 98.81 mm |
| February | -3.5 °C | 8.2 °C | 95.5 mm |
| March | -0.3 °C | 13.1 °C | 106.43 mm |
| April | 4.7 °C | 20 °C | 120.65 mm |
| May | 10.2 °C | 23.8 °C | 128.52 mm |
| June | 15.2 °C | 27.4 °C | 118.62 mm |
| July | 17.4 °C | 29.1 °C | 143.51 mm |
| August | 16.8 °C | 28.5 °C | 108.46 mm |
| September | 13.1 °C | 25.7 °C | 89.15 mm |
| October | 6.1 °C | 19.6 °C | 73.91 mm |
| November | 0.2 °C | 13.1 °C | 81.53 mm |
| December | -2.6 °C | 7.6 °C | 105.66 mm |
| Annual | 6 °C | 18.5 °C | 1270.75 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |