Mulhall, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.4 °C (low) to 22.1 °C (high). Annual precipitation averages 901.7 Millimeters. Mulhall 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 Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.3 °C | 9.5 °C | 30.48 mm |
| February | -2.5 °C | 11.4 °C | 37.34 mm |
| March | 2.3 °C | 16.9 °C | 60.2 mm |
| April | 7.3 °C | 21.9 °C | 99.82 mm |
| May | 13.5 °C | 26.3 °C | 127 mm |
| June | 19.1 °C | 31.3 °C | 121.41 mm |
| July | 21.3 °C | 34.4 °C | 82.55 mm |
| August | 20.4 °C | 34.2 °C | 91.19 mm |
| September | 15.8 °C | 29.9 °C | 83.06 mm |
| October | 8.7 °C | 23.2 °C | 81.53 mm |
| November | 2.2 °C | 16.4 °C | 46.48 mm |
| December | -3.1 °C | 10.1 °C | 40.64 mm |
| Annual | 8.4 °C | 22.1 °C | 901.7 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 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |