Norco, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 61.6 °F (low) to 78.1 °F (high). Annual precipitation averages 65.7 Inches. Norco is located in USDA Plant Hardiness Zone 9b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 44.9 °F | 62.3 °F | 5.61 in. |
| February | 48.3 °F | 66.0 °F | 4.41 in. |
| March | 54.4 °F | 72.2 °F | 4.56 in. |
| April | 60.8 °F | 78.0 °F | 5.02 in. |
| May | 68.5 °F | 84.6 °F | 5.74 in. |
| June | 74.2 °F | 89.3 °F | 7.53 in. |
| July | 76.0 °F | 90.9 °F | 7.4 in. |
| August | 75.7 °F | 91.2 °F | 6.9 in. |
| September | 72.6 °F | 87.7 °F | 5.42 in. |
| October | 63.4 °F | 80.1 °F | 4.04 in. |
| November | 53.3 °F | 70.7 °F | 4.09 in. |
| December | 47.5 °F | 64.5 °F | 4.98 in. |
| Annual | 61.6 °F | 78.1 °F | 65.7 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 |