Rupert, West Virginia has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.5 °C (low) to 15.9 °C (high). Annual precipitation averages 1260.4 Millimeters. Rupert is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.2 °C | 4.2 °C | 99.57 mm |
| February | -6.6 °C | 5.8 °C | 90.68 mm |
| March | -2.8 °C | 10.4 °C | 117.09 mm |
| April | 2.3 °C | 16.7 °C | 106.93 mm |
| May | 7.7 °C | 21.2 °C | 131.32 mm |
| June | 12.3 °C | 24.6 °C | 125.48 mm |
| July | 14.5 °C | 26.4 °C | 133.86 mm |
| August | 14.1 °C | 25.8 °C | 95 mm |
| September | 10.3 °C | 22.9 °C | 93.47 mm |
| October | 3.8 °C | 17.3 °C | 78.23 mm |
| November | -1.7 °C | 10.7 °C | 81.53 mm |
| December | -5.1 °C | 5.1 °C | 107.19 mm |
| Annual | 3.5 °C | 15.9 °C | 1260.35 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |