Carmen, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7.9 °C (low) to 22.1 °C (high). Annual precipitation averages 773.7 Millimeters. Carmen is located in USDA Plant Hardiness Zone 7a. 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 | -4.9 °C | 8.9 °C | 23.37 mm |
| February | -3.3 °C | 11 °C | 29.46 mm |
| March | 1.7 °C | 16.7 °C | 56.39 mm |
| April | 6.4 °C | 21.6 °C | 73.66 mm |
| May | 12.8 °C | 26.8 °C | 106.17 mm |
| June | 18.6 °C | 32.5 °C | 108.46 mm |
| July | 21.1 °C | 35.3 °C | 79.76 mm |
| August | 20.2 °C | 34.3 °C | 94.74 mm |
| September | 15.7 °C | 30.1 °C | 58.93 mm |
| October | 8.3 °C | 23.1 °C | 72.39 mm |
| November | 1.5 °C | 15.8 °C | 37.34 mm |
| December | -3.8 °C | 9.4 °C | 33.02 mm |
| Annual | 7.9 °C | 22.1 °C | 773.69 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |