River Ridge, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 62.3 °F (low) to 78.4 °F (high). Annual precipitation averages 65.7 Inches. River Ridge is located in USDA Plant Hardiness Zone 9b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 45.2 °F | 62.1 °F | 5.52 in. |
| February | 48.6 °F | 65.8 °F | 4.3 in. |
| March | 54.8 °F | 72.1 °F | 4.53 in. |
| April | 61.6 °F | 78.4 °F | 4.88 in. |
| May | 69.2 °F | 85.3 °F | 5.64 in. |
| June | 74.9 °F | 90.1 °F | 7.45 in. |
| July | 76.6 °F | 91.6 °F | 7.59 in. |
| August | 76.5 °F | 91.5 °F | 7.22 in. |
| September | 73.4 °F | 88.0 °F | 5.45 in. |
| October | 64.3 °F | 80.5 °F | 3.81 in. |
| November | 54.3 °F | 70.5 °F | 4.12 in. |
| December | 48.1 °F | 64.3 °F | 5.14 in. |
| Annual | 62.3 °F | 78.4 °F | 65.65 in. |
| Average First Frost Date | Frost Rare |
| Average Last Frost Date | |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 9b : 25°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 9a : 20°F to 25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |