Marshall, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.5 °C (low) to 22.1 °C (high). Annual precipitation averages 866.2 Millimeters. Marshall 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 | -4.2 °C | 9.2 °C | 27.43 mm |
| February | -2.4 °C | 11.2 °C | 37.85 mm |
| March | 2.4 °C | 16.7 °C | 61.72 mm |
| April | 7.3 °C | 21.6 °C | 91.44 mm |
| May | 13.4 °C | 26.4 °C | 120.9 mm |
| June | 19 °C | 31.7 °C | 122.94 mm |
| July | 21.4 °C | 34.8 °C | 81.03 mm |
| August | 20.6 °C | 34.3 °C | 87.88 mm |
| September | 16.1 °C | 30.1 °C | 74.68 mm |
| October | 9 °C | 23.2 °C | 77.22 mm |
| November | 2.4 °C | 16.2 °C | 45.72 mm |
| December | -2.9 °C | 9.8 °C | 37.34 mm |
| Annual | 8.5 °C | 22.1 °C | 866.15 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 |