Gary, West Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 42.5 °F (low) to 65.3 °F (high). Annual precipitation averages 43.8 Inches. Gary 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 | 23.2 °F | 43.0 °F | 3.22 in. |
| February | 25.2 °F | 46.9 °F | 3.12 in. |
| March | 31.1 °F | 55.2 °F | 3.94 in. |
| April | 40.2 °F | 67.3 °F | 4.24 in. |
| May | 50.1 °F | 74.6 °F | 4.6 in. |
| June | 58.8 °F | 81.1 °F | 4.21 in. |
| July | 63.0 °F | 84.4 °F | 4.76 in. |
| August | 61.9 °F | 83.5 °F | 3.99 in. |
| September | 54.8 °F | 78.2 °F | 3.02 in. |
| October | 42.5 °F | 67.4 °F | 2.64 in. |
| November | 32.2 °F | 55.9 °F | 2.52 in. |
| December | 26.7 °F | 46.3 °F | 3.49 in. |
| Annual | 42.5 °F | 65.3 °F | 43.75 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |