McCurtain, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.4 °C (low) to 22.9 °C (high). Annual precipitation averages 1230.9 Millimeters. McCurtain is located in USDA Plant Hardiness Zone 7b. 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 | -1.5 °C | 10.6 °C | 75.95 mm |
| February | 0.5 °C | 13.1 °C | 69.09 mm |
| March | 5 °C | 17.8 °C | 109.98 mm |
| April | 9.7 °C | 22.8 °C | 123.7 mm |
| May | 15.2 °C | 26.8 °C | 145.03 mm |
| June | 19.8 °C | 31.3 °C | 124.71 mm |
| July | 22.2 °C | 34.3 °C | 86.87 mm |
| August | 21.2 °C | 34.2 °C | 78.23 mm |
| September | 16.9 °C | 30.2 °C | 125.48 mm |
| October | 10.5 °C | 24.2 °C | 92.2 mm |
| November | 4.7 °C | 17.6 °C | 114.55 mm |
| December | 0.1 °C | 11.9 °C | 85.09 mm |
| Annual | 10.4 °C | 22.9 °C | 1230.88 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 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |