Chelsea, Alabama has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 51.4 °F (low) to 74.4 °F (high). Annual precipitation averages 58.4 Inches. Chelsea is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 33.2 °F | 54.9 °F | 5.22 in. |
| February | 36.2 °F | 59.5 °F | 5.54 in. |
| March | 42.7 °F | 67.3 °F | 5.54 in. |
| April | 49.6 °F | 75.2 °F | 5.24 in. |
| May | 58.8 °F | 81.9 °F | 4.46 in. |
| June | 66.5 °F | 87.7 °F | 5.0 in. |
| July | 69.8 °F | 90.7 °F | 4.96 in. |
| August | 68.9 °F | 90.2 °F | 4.43 in. |
| September | 63.2 °F | 86.0 °F | 4.51 in. |
| October | 51.4 °F | 76.2 °F | 3.45 in. |
| November | 40.7 °F | 65.4 °F | 4.58 in. |
| December | 35.8 °F | 57.2 °F | 5.51 in. |
| Annual | 51.4 °F | 74.4 °F | 58.44 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |