Princeton, West Virginia has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 5.3 °C (low) to 17.5 °C (high). Annual precipitation averages 1033.5 Millimeters. Princeton 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 | -5.1 °C | 5.4 °C | 79.76 mm |
| February | -3.8 °C | 7.4 °C | 74.68 mm |
| March | -0.5 °C | 12.1 °C | 95.25 mm |
| April | 4.4 °C | 18.3 °C | 93.22 mm |
| May | 9.4 °C | 22.7 °C | 115.82 mm |
| June | 13.8 °C | 25.9 °C | 100.84 mm |
| July | 15.9 °C | 27.7 °C | 101.6 mm |
| August | 15.3 °C | 27.2 °C | 85.34 mm |
| September | 11.8 °C | 24.4 °C | 75.44 mm |
| October | 5.3 °C | 18.7 °C | 64.26 mm |
| November | -0.2 °C | 12.7 °C | 62.74 mm |
| December | -3.1 °C | 7.3 °C | 84.58 mm |
| Annual | 5.3 °C | 17.5 °C | 1033.53 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 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |