Terral, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.3 °C (low) to 24.3 °C (high). Annual precipitation averages 858 Millimeters. Terral 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 | -1.7 °C | 12.6 °C | 38.35 mm |
| February | 0.4 °C | 14.5 °C | 51.05 mm |
| March | 5.2 °C | 19.4 °C | 68.33 mm |
| April | 9.4 °C | 23.9 °C | 74.17 mm |
| May | 15.2 °C | 28.2 °C | 113.28 mm |
| June | 20.1 °C | 32.8 °C | 101.35 mm |
| July | 22.1 °C | 35.6 °C | 53.59 mm |
| August | 21.5 °C | 35.8 °C | 62.99 mm |
| September | 17.2 °C | 31.4 °C | 90.68 mm |
| October | 10.5 °C | 25.4 °C | 94.74 mm |
| November | 4.3 °C | 18.7 °C | 57.15 mm |
| December | -0.8 °C | 13.1 °C | 52.32 mm |
| Annual | 10.3 °C | 24.3 °C | 858 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 7b : -15°C to -12.2°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |