Callahan, Florida has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 15.1 °C (low) to 26.3 °C (high). Annual precipitation averages 1333 Millimeters. 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 | 6.1 °C | 18.3 °C | 89.15 mm |
| February | 7.6 °C | 20 °C | 75.44 mm |
| March | 10.4 °C | 23.1 °C | 89.92 mm |
| April | 14.1 °C | 26.4 °C | 75.44 mm |
| May | 18.2 °C | 29.8 °C | 78.23 mm |
| June | 21.8 °C | 32.1 °C | 184.15 mm |
| July | 23 °C | 33.2 °C | 170.18 mm |
| August | 23.1 °C | 32.6 °C | 177.04 mm |
| September | 21.4 °C | 30.8 °C | 180.09 mm |
| October | 16.5 °C | 27.1 °C | 92.46 mm |
| November | 10.8 °C | 22.6 °C | 51.31 mm |
| December | 7.7 °C | 19.4 °C | 69.6 mm |
| Annual | 15.1 °C | 26.3 °C | 1333.01 mm |
| 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 : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 9a : -6.7°C to -3.9°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |