Hamlin, West Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 43.6 °F (low) to 67.5 °F (high). Annual precipitation averages 46.4 Inches. Hamlin is located in USDA Plant Hardiness Zone 6b. 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 | 23.6 °F | 43.6 °F | 3.36 in. |
| February | 25.7 °F | 47.7 °F | 3.1 in. |
| March | 32.1 °F | 57.0 °F | 4.4 in. |
| April | 41.7 °F | 69.8 °F | 3.7 in. |
| May | 51.7 °F | 77.4 °F | 4.86 in. |
| June | 60.5 °F | 84.3 °F | 4.45 in. |
| July | 64.4 °F | 87.4 °F | 5.43 in. |
| August | 63.2 °F | 86.6 °F | 3.58 in. |
| September | 55.9 °F | 81.1 °F | 3.35 in. |
| October | 43.4 °F | 69.9 °F | 3.18 in. |
| November | 33.4 °F | 57.7 °F | 3.15 in. |
| December | 28.0 °F | 47.4 °F | 3.85 in. |
| Annual | 43.6 °F | 67.5 °F | 46.41 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 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |