Martha, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.5 °C (low) to 23.9 °C (high). Annual precipitation averages 708.7 Millimeters. Martha 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 | -2.9 °C | 11.7 °C | 25.4 mm |
| February | -0.9 °C | 13.7 °C | 29.21 mm |
| March | 3.7 °C | 19 °C | 46.23 mm |
| April | 8.1 °C | 23.7 °C | 72.14 mm |
| May | 14.4 °C | 28.7 °C | 104.9 mm |
| June | 19.9 °C | 33.6 °C | 92.2 mm |
| July | 21.9 °C | 35.8 °C | 64.77 mm |
| August | 21.2 °C | 35.2 °C | 71.63 mm |
| September | 16.9 °C | 30.8 °C | 68.58 mm |
| October | 9.9 °C | 24.8 °C | 65.79 mm |
| November | 3.2 °C | 17.7 °C | 36.83 mm |
| December | -1.9 °C | 11.9 °C | 30.99 mm |
| Annual | 9.5 °C | 23.9 °C | 708.67 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 | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |