Carter, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.5 °C (low) to 23 °C (high). Annual precipitation averages 688.4 Millimeters. Carter is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -3.6 °C | 10.7 °C | 22.1 mm |
| February | -1.9 °C | 12.7 °C | 26.42 mm |
| March | 2.7 °C | 17.8 °C | 46.23 mm |
| April | 7.4 °C | 22.6 °C | 68.58 mm |
| May | 13.3 °C | 27.4 °C | 102.62 mm |
| June | 18.7 °C | 32.3 °C | 87.12 mm |
| July | 20.9 °C | 35.3 °C | 56.39 mm |
| August | 20.2 °C | 34.8 °C | 83.57 mm |
| September | 15.9 °C | 30.3 °C | 66.04 mm |
| October | 9 °C | 23.8 °C | 64.01 mm |
| November | 2.3 °C | 16.8 °C | 36.07 mm |
| December | -2.7 °C | 11 °C | 29.21 mm |
| Annual | 8.5 °C | 23 °C | 688.36 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |