Callahan, Florida has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 59.1 °F (low) to 79.3 °F (high). Annual precipitation averages 52.5 Inches. Callahan is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 11 - Feb. 20 through the first frost around Dec. 11 - Dec. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 42.9 °F | 64.9 °F | 3.51 in. |
| February | 45.7 °F | 68.0 °F | 2.97 in. |
| March | 50.8 °F | 73.5 °F | 3.54 in. |
| April | 57.4 °F | 79.6 °F | 2.97 in. |
| May | 64.8 °F | 85.6 °F | 3.08 in. |
| June | 71.3 °F | 89.8 °F | 7.25 in. |
| July | 73.4 °F | 91.7 °F | 6.7 in. |
| August | 73.6 °F | 90.7 °F | 6.97 in. |
| September | 70.6 °F | 87.4 °F | 7.09 in. |
| October | 61.7 °F | 80.7 °F | 3.64 in. |
| November | 51.5 °F | 72.6 °F | 2.02 in. |
| December | 45.9 °F | 66.9 °F | 2.74 in. |
| Annual | 59.1 °F | 79.3 °F | 52.48 in. |
| Average First Frost Date | Dec. 11 - Dec. 20 |
| Average Last Frost Date | Feb. 11 - Feb. 20 |
| Average Days With Frost | 10-20 Days |
| Plant Hardiness Zone | Zone 9a : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 9a : 20°F to 25°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |