Port Barre, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 14.4 °C (low) to 25.7 °C (high). Annual precipitation averages 1608.1 Millimeters. Port Barre 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 | 5.1 °C | 16.4 °C | 170.94 mm |
| February | 7 °C | 18.4 °C | 123.19 mm |
| March | 10.4 °C | 22.3 °C | 108.46 mm |
| April | 13.9 °C | 25.7 °C | 129.03 mm |
| May | 18.6 °C | 29.4 °C | 140.21 mm |
| June | 22 °C | 32.2 °C | 158.24 mm |
| July | 23.1 °C | 32.9 °C | 135.13 mm |
| August | 22.7 °C | 33.3 °C | 138.43 mm |
| September | 20.1 °C | 31.2 °C | 129.03 mm |
| October | 14.3 °C | 27.1 °C | 121.92 mm |
| November | 8.9 °C | 21.5 °C | 123.7 mm |
| December | 6.2 °C | 17.5 °C | 129.79 mm |
| Annual | 14.4 °C | 25.7 °C | 1608.07 mm |
| 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 : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 9a : -6.7°C to -3.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |