Itmann, West Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 5.9 °C (low) to 18.3 °C (high). Annual precipitation averages 1239.5 Millimeters. Itmann 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. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.8 °C | 5.8 °C | 100.58 mm |
| February | -3.6 °C | 8.1 °C | 91.44 mm |
| March | -0.3 °C | 12.7 °C | 107.44 mm |
| April | 4.7 °C | 19.5 °C | 113.28 mm |
| May | 10.1 °C | 23.6 °C | 131.32 mm |
| June | 14.8 °C | 27.1 °C | 114.81 mm |
| July | 17.1 °C | 28.8 °C | 135.38 mm |
| August | 16.4 °C | 28.2 °C | 102.11 mm |
| September | 12.7 °C | 25.3 °C | 85.6 mm |
| October | 5.9 °C | 19.4 °C | 76.71 mm |
| November | 0.3 °C | 12.9 °C | 79.76 mm |
| December | -2.6 °C | 7.6 °C | 101.09 mm |
| Annual | 5.9 °C | 18.3 °C | 1239.52 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 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 | Cfa - Humid Subtropical Climate |