Marmet, West Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 6.7 °C (low) to 19.4 °C (high). Annual precipitation averages 1183.9 Millimeters. Marmet 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 | -4.3 °C | 6.3 °C | 83.06 mm |
| February | -3.3 °C | 8.3 °C | 78.99 mm |
| March | 0.2 °C | 13.5 °C | 105.92 mm |
| April | 5.6 °C | 20.4 °C | 96.77 mm |
| May | 11.2 °C | 24.7 °C | 125.22 mm |
| June | 15.9 °C | 28.5 °C | 112.27 mm |
| July | 18.2 °C | 30.3 °C | 144.02 mm |
| August | 17.6 °C | 29.8 °C | 100.33 mm |
| September | 13.7 °C | 26.9 °C | 88.14 mm |
| October | 7 °C | 20.8 °C | 77.98 mm |
| November | 0.9 °C | 14.2 °C | 75.18 mm |
| December | -2.1 °C | 8.5 °C | 96.01 mm |
| Annual | 6.7 °C | 19.4 °C | 1183.89 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |