Whitmer, West Virginia has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.3 °C (low) to 14.9 °C (high). Annual precipitation averages 1440.9 Millimeters. Whitmer is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.3 °C | 2.3 °C | 113.79 mm |
| February | -7.7 °C | 3.8 °C | 98.81 mm |
| March | -4.1 °C | 8.4 °C | 122.68 mm |
| April | 1.4 °C | 15.4 °C | 123.44 mm |
| May | 6.6 °C | 19.9 °C | 155.7 mm |
| June | 11.1 °C | 23.9 °C | 150.62 mm |
| July | 13.2 °C | 25.8 °C | 156.97 mm |
| August | 12.4 °C | 25.3 °C | 116.33 mm |
| September | 8.8 °C | 22.6 °C | 106.43 mm |
| October | 2.8 °C | 16.6 °C | 97.79 mm |
| November | -2.4 °C | 10 °C | 87.63 mm |
| December | -5.9 °C | 4.6 °C | 110.74 mm |
| Annual | 2.3 °C | 14.9 °C | 1440.93 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |