Plymouth, North Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.7 °C (low) to 22.1 °C (high). Annual precipitation averages 1349.8 Millimeters. Plymouth 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 | 11.4 °C | 97.54 mm |
| February | 1.2 °C | 13.2 °C | 84.07 mm |
| March | 4.6 °C | 17 °C | 103.63 mm |
| April | 9.8 °C | 22.3 °C | 92.71 mm |
| May | 14.8 °C | 26.2 °C | 102.87 mm |
| June | 19.3 °C | 30.1 °C | 130.3 mm |
| July | 21.6 °C | 31.8 °C | 140.46 mm |
| August | 20.7 °C | 30.9 °C | 161.8 mm |
| September | 17.9 °C | 28.2 °C | 156.72 mm |
| October | 11.3 °C | 23.3 °C | 101.35 mm |
| November | 5.3 °C | 17.7 °C | 88.65 mm |
| December | 1.9 °C | 13.3 °C | 89.66 mm |
| Annual | 10.7 °C | 22.1 °C | 1349.76 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 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |