Cullomburg, Alabama has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 11.8 °C (low) to 24.9 °C (high). Annual precipitation averages 1476 Millimeters. Cullomburg is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 1.8 °C | 14.8 °C | 147.32 mm |
| February | 3.8 °C | 17.4 °C | 131.06 mm |
| March | 7.1 °C | 21.6 °C | 147.07 mm |
| April | 10.8 °C | 25.2 °C | 114.55 mm |
| May | 15.7 °C | 29.1 °C | 106.17 mm |
| June | 20.1 °C | 31.9 °C | 138.94 mm |
| July | 21.5 °C | 33.1 °C | 136.91 mm |
| August | 21.1 °C | 32.9 °C | 124.97 mm |
| September | 18.3 °C | 30.6 °C | 100.58 mm |
| October | 11.8 °C | 25.8 °C | 83.82 mm |
| November | 5.9 °C | 20.1 °C | 105.41 mm |
| December | 3.1 °C | 15.9 °C | 139.19 mm |
| Annual | 11.8 °C | 24.9 °C | 1475.99 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 40-50 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |