Osage, West Virginia has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 41.9 °F (low) to 63.3 °F (high). Annual precipitation averages 45.3 Inches. Osage is located in USDA Plant Hardiness Zone 6b. 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 | 21.6 °F | 39.0 °F | 3.46 in. |
| February | 23.2 °F | 42.2 °F | 3.16 in. |
| March | 29.6 °F | 51.6 °F | 3.81 in. |
| April | 39.4 °F | 64.9 °F | 3.9 in. |
| May | 49.6 °F | 73.7 °F | 4.44 in. |
| June | 58.4 °F | 81.0 °F | 4.31 in. |
| July | 62.7 °F | 84.6 °F | 4.83 in. |
| August | 61.3 °F | 83.6 °F | 3.9 in. |
| September | 54.2 °F | 77.7 °F | 3.47 in. |
| October | 42.7 °F | 65.7 °F | 3.19 in. |
| November | 33.1 °F | 53.3 °F | 3.19 in. |
| December | 26.5 °F | 42.8 °F | 3.66 in. |
| Annual | 41.9 °F | 63.3 °F | 45.32 in. |
| 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 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |