Littleton, West Virginia has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 4.4 °C (low) to 17.5 °C (high). Annual precipitation averages 1207.8 Millimeters. Littleton is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.7 °C | 3.9 °C | 107.7 mm |
| February | -5.8 °C | 5.8 °C | 83.31 mm |
| March | -2.2 °C | 11.1 °C | 105.92 mm |
| April | 3.1 °C | 18.6 °C | 102.11 mm |
| May | 8.7 °C | 23.3 °C | 111.76 mm |
| June | 13.7 °C | 27.2 °C | 114.3 mm |
| July | 16 °C | 29.1 °C | 115.06 mm |
| August | 15.2 °C | 28.6 °C | 99.82 mm |
| September | 11.2 °C | 25.5 °C | 93.73 mm |
| October | 4.6 °C | 18.9 °C | 85.34 mm |
| November | -0.6 °C | 12.1 °C | 85.34 mm |
| December | -4.1 °C | 6.1 °C | 103.38 mm |
| Annual | 4.4 °C | 17.5 °C | 1207.77 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |