Longstreet, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 54.8 °F (low) to 76.7 °F (high). Annual precipitation averages 53.7 Inches. Longstreet is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 36.4 °F | 57.9 °F | 4.99 in. |
| February | 40.1 °F | 62.5 °F | 4.6 in. |
| March | 46.4 °F | 69.5 °F | 5.24 in. |
| April | 53.5 °F | 76.4 °F | 4.93 in. |
| May | 62.6 °F | 83.4 °F | 4.55 in. |
| June | 70.0 °F | 89.7 °F | 4.45 in. |
| July | 72.9 °F | 93.1 °F | 3.66 in. |
| August | 72.2 °F | 93.7 °F | 3.41 in. |
| September | 65.6 °F | 88.3 °F | 3.58 in. |
| October | 54.4 °F | 78.7 °F | 4.59 in. |
| November | 44.8 °F | 67.4 °F | 4.37 in. |
| December | 38.6 °F | 59.4 °F | 5.35 in. |
| Annual | 54.8 °F | 76.7 °F | 53.72 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 30-40 Days |
| Plant Hardiness Zone | Zone 8b : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |