Zachary, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 57.1 °F (low) to 78.3 °F (high). Annual precipitation averages 64.3 Inches. Zachary 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 Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 40.4 °F | 61.6 °F | 6.66 in. |
| February | 43.7 °F | 65.7 °F | 5.28 in. |
| March | 49.8 °F | 72.4 °F | 4.78 in. |
| April | 56.2 °F | 78.5 °F | 5.1 in. |
| May | 64.3 °F | 85.0 °F | 5.83 in. |
| June | 70.8 °F | 90.1 °F | 6.62 in. |
| July | 72.8 °F | 91.6 °F | 5.4 in. |
| August | 72.4 °F | 92.2 °F | 5.79 in. |
| September | 67.9 °F | 88.5 °F | 4.58 in. |
| October | 57.1 °F | 80.2 °F | 4.82 in. |
| November | 47.2 °F | 70.3 °F | 4.06 in. |
| December | 42.0 °F | 63.5 °F | 5.41 in. |
| Annual | 57.1 °F | 78.3 °F | 64.33 in. |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| 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 8b : 15°F to 20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |