Pearl River, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 56.9 °F (low) to 77.8 °F (high). Annual precipitation averages 65.8 Inches. Pearl River is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 21 - Feb. 29 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 40.2 °F | 61.6 °F | 5.78 in. |
| February | 43.1 °F | 65.2 °F | 4.7 in. |
| March | 49.5 °F | 71.5 °F | 5.2 in. |
| April | 55.7 °F | 77.5 °F | 5.5 in. |
| May | 63.9 °F | 84.5 °F | 5.49 in. |
| June | 70.7 °F | 89.4 °F | 6.4 in. |
| July | 72.8 °F | 91.0 °F | 7.64 in. |
| August | 72.6 °F | 91.1 °F | 6.79 in. |
| September | 68.4 °F | 87.7 °F | 5.0 in. |
| October | 57.3 °F | 80.2 °F | 3.88 in. |
| November | 47.0 °F | 70.6 °F | 4.31 in. |
| December | 41.9 °F | 63.6 °F | 5.15 in. |
| Annual | 56.9 °F | 77.8 °F | 65.84 in. |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Feb. 21 - Feb. 29 |
| 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 |