May, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7 °C (low) to 22.1 °C (high). Annual precipitation averages 603.7 Millimeters. May is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.7 °C | 9.5 °C | 18.29 mm |
| February | -4.1 °C | 11.3 °C | 21.08 mm |
| March | 0.9 °C | 16.9 °C | 42.67 mm |
| April | 5.8 °C | 21.8 °C | 57.4 mm |
| May | 12 °C | 26.8 °C | 75.69 mm |
| June | 17.8 °C | 31.8 °C | 90.93 mm |
| July | 20.3 °C | 34.8 °C | 67.06 mm |
| August | 19.2 °C | 34.1 °C | 75.69 mm |
| September | 14.6 °C | 29.8 °C | 44.7 mm |
| October | 7.3 °C | 23 °C | 58.67 mm |
| November | 0.4 °C | 15.9 °C | 24.38 mm |
| December | -4.7 °C | 9.7 °C | 27.18 mm |
| Annual | 7 °C | 22.1 °C | 603.74 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |