Grandy, North Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 12.6 °C (low) to 20.5 °C (high). Annual precipitation averages 1284.2 Millimeters. Grandy 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. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 2.2 °C | 10.8 °C | 98.3 mm |
| February | 2.7 °C | 11.7 °C | 79.25 mm |
| March | 5.6 °C | 15 °C | 98.04 mm |
| April | 10.6 °C | 19.6 °C | 87.63 mm |
| May | 15.4 °C | 23.6 °C | 97.28 mm |
| June | 20.5 °C | 27.9 °C | 117.35 mm |
| July | 22.9 °C | 30.1 °C | 135.89 mm |
| August | 22.4 °C | 29.2 °C | 146.05 mm |
| September | 20.5 °C | 26.6 °C | 135.38 mm |
| October | 14.9 °C | 22.1 °C | 103.63 mm |
| November | 8.8 °C | 16.8 °C | 89.41 mm |
| December | 4.8 °C | 12.9 °C | 96.01 mm |
| Annual | 12.6 °C | 20.5 °C | 1284.22 mm |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 30-40 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 |