Cary, North Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.4 °C (low) to 21.4 °C (high). Annual precipitation averages 1234.2 Millimeters. Cary is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -0.2 °C | 10.4 °C | 89.66 mm |
| February | 1 °C | 12.2 °C | 76.2 mm |
| March | 4.7 °C | 16.4 °C | 102.87 mm |
| April | 9.7 °C | 21.7 °C | 92.96 mm |
| May | 14.6 °C | 25.7 °C | 92.71 mm |
| June | 19.1 °C | 29.7 °C | 113.03 mm |
| July | 21.3 °C | 31.6 °C | 126.75 mm |
| August | 20.4 °C | 30.6 °C | 124.71 mm |
| September | 17.3 °C | 27.4 °C | 143 mm |
| October | 10.6 °C | 22.1 °C | 96.01 mm |
| November | 4.8 °C | 16.7 °C | 86.61 mm |
| December | 1.6 °C | 12.1 °C | 89.66 mm |
| Annual | 10.4 °C | 21.4 °C | 1234.17 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |