Grambling, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 11.5 °C (low) to 24.5 °C (high). Annual precipitation averages 1420.1 Millimeters. Grambling is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 1.3 °C | 13.9 °C | 139.45 mm |
| February | 3.1 °C | 16.1 °C | 128.02 mm |
| March | 6.7 °C | 20.4 °C | 129.03 mm |
| April | 10.7 °C | 24.4 °C | 135.89 mm |
| May | 15.9 °C | 28.4 °C | 121.67 mm |
| June | 20.2 °C | 32.1 °C | 116.84 mm |
| July | 21.8 °C | 33.8 °C | 93.22 mm |
| August | 21.3 °C | 33.8 °C | 93.22 mm |
| September | 17.6 °C | 31.2 °C | 91.19 mm |
| October | 11.3 °C | 25.7 °C | 121.41 mm |
| November | 5.9 °C | 19.4 °C | 115.06 mm |
| December | 2.3 °C | 14.8 °C | 135.13 mm |
| Annual | 11.5 °C | 24.5 °C | 1420.13 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 40-50 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |