Pearl River, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 13.9 °C (low) to 25.5 °C (high). Annual precipitation averages 1672.3 Millimeters. 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 | 4.6 °C | 16.4 °C | 146.81 mm |
| February | 6.2 °C | 18.4 °C | 119.38 mm |
| March | 9.7 °C | 21.9 °C | 132.08 mm |
| April | 13.2 °C | 25.3 °C | 139.7 mm |
| May | 17.7 °C | 29.2 °C | 139.45 mm |
| June | 21.5 °C | 31.9 °C | 162.56 mm |
| July | 22.7 °C | 32.8 °C | 194.06 mm |
| August | 22.6 °C | 32.8 °C | 172.47 mm |
| September | 20.2 °C | 30.9 °C | 127 mm |
| October | 14.1 °C | 26.8 °C | 98.55 mm |
| November | 8.3 °C | 21.4 °C | 109.47 mm |
| December | 5.5 °C | 17.6 °C | 130.81 mm |
| Annual | 13.9 °C | 25.5 °C | 1672.34 mm |
| 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 : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |