Stem, North Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.7 °C (low) to 21.2 °C (high). Annual precipitation averages 1180.1 Millimeters. Stem is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -1.8 °C | 10 °C | 92.2 mm |
| February | -0.8 °C | 11.9 °C | 75.44 mm |
| March | 2.7 °C | 16.3 °C | 109.22 mm |
| April | 7.8 °C | 21.8 °C | 95 mm |
| May | 13.1 °C | 25.6 °C | 95 mm |
| June | 17.8 °C | 29.6 °C | 102.62 mm |
| July | 20 °C | 31.6 °C | 119.13 mm |
| August | 19.2 °C | 30.5 °C | 103.38 mm |
| September | 15.7 °C | 27.3 °C | 124.71 mm |
| October | 8.7 °C | 21.8 °C | 91.95 mm |
| November | 2.7 °C | 16.3 °C | 83.06 mm |
| December | -0.2 °C | 11.7 °C | 88.39 mm |
| Annual | 8.7 °C | 21.2 °C | 1180.1 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 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 |