Altha, Florida has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 56 °F (low) to 78.7 °F (high). Annual precipitation averages 58.8 Inches. Altha is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 39.4 °F | 62.5 °F | 4.82 in. |
| February | 42.3 °F | 66.2 °F | 4.66 in. |
| March | 47.3 °F | 73.0 °F | 5.22 in. |
| April | 53.9 °F | 79.2 °F | 4.58 in. |
| May | 62.9 °F | 86.3 °F | 3.72 in. |
| June | 69.4 °F | 90.1 °F | 6.15 in. |
| July | 71.5 °F | 91.8 °F | 6.47 in. |
| August | 71.1 °F | 90.5 °F | 6.13 in. |
| September | 67.3 °F | 87.4 °F | 5.96 in. |
| October | 57.5 °F | 80.8 °F | 3.2 in. |
| November | 46.6 °F | 71.3 °F | 3.62 in. |
| December | 42.2 °F | 64.7 °F | 4.22 in. |
| Annual | 56 °F | 78.7 °F | 58.75 in. |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 20-30 Days |
| Plant Hardiness Zone | Zone 9a : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |