Hammond, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 56.7 °F (low) to 78.7 °F (high). Annual precipitation averages 65.1 Inches. Hammond is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Jan. 21 - Jan. 31 through the first frost around Jan. 1 - Jan. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 40.3 °F | 61.9 °F | 5.86 in. |
| February | 43.3 °F | 65.8 °F | 5.04 in. |
| March | 49.4 °F | 72.5 °F | 5.32 in. |
| April | 55.3 °F | 78.8 °F | 5.31 in. |
| May | 63.3 °F | 85.5 °F | 5.41 in. |
| June | 69.9 °F | 90.6 °F | 6.75 in. |
| July | 72.1 °F | 92.2 °F | 6.64 in. |
| August | 72.0 °F | 92.4 °F | 6.61 in. |
| September | 67.8 °F | 88.7 °F | 4.76 in. |
| October | 57.8 °F | 80.9 °F | 4.05 in. |
| November | 47.6 °F | 70.6 °F | 3.95 in. |
| December | 42.0 °F | 64.0 °F | 5.38 in. |
| Annual | 56.7 °F | 78.7 °F | 65.08 in. |
| Average First Frost Date | Jan. 1 - Jan. 10 |
| Average Last Frost Date | Jan. 21 - Jan. 31 |
| Average Days With Frost | Frost Rare |
| 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 |