Keyser, West Virginia has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.3 °C (low) to 18.4 °C (high). Annual precipitation averages 988.3 Millimeters. Keyser is located in USDA Plant Hardiness Zone 7a. 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 | -5.2 °C | 4.6 °C | 69.85 mm |
| February | -4.6 °C | 6.7 °C | 62.74 mm |
| March | -0.9 °C | 11.4 °C | 87.88 mm |
| April | 4 °C | 19.3 °C | 88.14 mm |
| May | 9.2 °C | 24.1 °C | 110.24 mm |
| June | 14.2 °C | 28.3 °C | 103.63 mm |
| July | 16.7 °C | 30.7 °C | 96.52 mm |
| August | 15.8 °C | 29.9 °C | 81.53 mm |
| September | 11.9 °C | 26.4 °C | 90.68 mm |
| October | 5.7 °C | 19.7 °C | 61.21 mm |
| November | 0.3 °C | 12.6 °C | 62.48 mm |
| December | -3.1 °C | 6.7 °C | 73.41 mm |
| Annual | 5.3 °C | 18.4 °C | 988.31 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 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 | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |