Semmes, Alabama has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 13.8 °C (low) to 25 °C (high). Annual precipitation averages 1727.2 Millimeters. Semmes is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 21 - Feb. 29 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 4.1 °C | 16 °C | 145.8 mm |
| February | 6 °C | 18.2 °C | 115.82 mm |
| March | 9.6 °C | 21.9 °C | 131.83 mm |
| April | 13.3 °C | 24.9 °C | 141.48 mm |
| May | 17.8 °C | 28.8 °C | 143.51 mm |
| June | 21.8 °C | 31.6 °C | 171.45 mm |
| July | 22.7 °C | 32.3 °C | 192.53 mm |
| August | 22.6 °C | 32.3 °C | 185.42 mm |
| September | 20.3 °C | 30.6 °C | 145.8 mm |
| October | 14.1 °C | 26.1 °C | 109.98 mm |
| November | 8.1 °C | 20.8 °C | 106.68 mm |
| December | 5.3 °C | 16.9 °C | 136.91 mm |
| Annual | 13.8 °C | 25 °C | 1727.21 mm |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Feb. 21 - Feb. 29 |
| Average Days With Frost | 10-20 Days |
| Plant Hardiness Zone | Zone 9a : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |