Delaware, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 46.8 °F (low) to 69.9 °F (high). Annual precipitation averages 42.5 Inches. Delaware 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 Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 23.8 °F | 46.2 °F | 1.61 in. |
| February | 27.1 °F | 50.8 °F | 1.77 in. |
| March | 36.2 °F | 60.4 °F | 3.09 in. |
| April | 45.7 °F | 69.7 °F | 4.56 in. |
| May | 56.4 °F | 77.4 °F | 6.66 in. |
| June | 65.8 °F | 86.2 °F | 5.2 in. |
| July | 69.9 °F | 91.6 °F | 3.77 in. |
| August | 67.9 °F | 91.3 °F | 3.66 in. |
| September | 59.6 °F | 83.9 °F | 3.83 in. |
| October | 47.0 °F | 72.2 °F | 3.6 in. |
| November | 35.9 °F | 60.0 °F | 2.62 in. |
| December | 26.7 °F | 48.6 °F | 2.16 in. |
| Annual | 46.8 °F | 69.9 °F | 42.53 in. |
| 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 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |