Corn, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.9 °C (low) to 22.6 °C (high). Annual precipitation averages 778.5 Millimeters. Corn is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -3.3 °C | 10 °C | 27.18 mm |
| February | -1.6 °C | 12.1 °C | 32.26 mm |
| March | 3 °C | 17.2 °C | 59.44 mm |
| April | 7.6 °C | 22 °C | 75.69 mm |
| May | 13.7 °C | 27.1 °C | 111 mm |
| June | 19.1 °C | 32.3 °C | 102.62 mm |
| July | 21.3 °C | 35.2 °C | 62.23 mm |
| August | 20.6 °C | 34.7 °C | 89.92 mm |
| September | 16.3 °C | 30.1 °C | 69.34 mm |
| October | 9.3 °C | 23.5 °C | 72.9 mm |
| November | 2.8 °C | 16.3 °C | 40.89 mm |
| December | -2.3 °C | 10.5 °C | 35.05 mm |
| Annual | 8.9 °C | 22.6 °C | 778.52 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |