Port Barre, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 57.8 °F (low) to 78.2 °F (high). Annual precipitation averages 63.3 Inches. 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 | 41.1 °F | 61.5 °F | 6.73 in. |
| February | 44.6 °F | 65.2 °F | 4.85 in. |
| March | 50.8 °F | 72.1 °F | 4.27 in. |
| April | 57.1 °F | 78.3 °F | 5.08 in. |
| May | 65.5 °F | 85.0 °F | 5.52 in. |
| June | 71.6 °F | 89.9 °F | 6.23 in. |
| July | 73.5 °F | 91.3 °F | 5.32 in. |
| August | 72.8 °F | 91.9 °F | 5.45 in. |
| September | 68.2 °F | 88.2 °F | 5.08 in. |
| October | 57.7 °F | 80.7 °F | 4.8 in. |
| November | 48.1 °F | 70.7 °F | 4.87 in. |
| December | 43.1 °F | 63.5 °F | 5.11 in. |
| Annual | 57.8 °F | 78.2 °F | 63.31 in. |
| 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 : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 9a : 20°F to 25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |