Macclenny, Florida has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 14.1 °C (low) to 26.6 °C (high). Annual precipitation averages 1352.5 Millimeters. Macclenny 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. 21 - Dec. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 5.3 °C | 18.8 °C | 100.33 mm |
| February | 6.9 °C | 20.5 °C | 75.18 mm |
| March | 9.6 °C | 23.7 °C | 94.74 mm |
| April | 12.9 °C | 26.7 °C | 75.95 mm |
| May | 17.1 °C | 30.2 °C | 82.04 mm |
| June | 20.8 °C | 32.1 °C | 209.04 mm |
| July | 22.1 °C | 33.1 °C | 173.74 mm |
| August | 22.3 °C | 32.7 °C | 184.66 mm |
| September | 20.6 °C | 31 °C | 149.35 mm |
| October | 15.3 °C | 27.2 °C | 89.66 mm |
| November | 9.8 °C | 23.2 °C | 49.02 mm |
| December | 6.7 °C | 20 °C | 68.83 mm |
| Annual | 14.1 °C | 26.6 °C | 1352.54 mm |
| Average First Frost Date | Dec. 21 - Dec. 31 |
| 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 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |