Hickory, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.6 °C (low) to 22.4 °C (high). Annual precipitation averages 1023.4 Millimeters. Hickory 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 Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -2.2 °C | 10.7 °C | 49.28 mm |
| February | -0.4 °C | 12.7 °C | 54.61 mm |
| March | 4.6 °C | 17.6 °C | 79.25 mm |
| April | 8.8 °C | 22 °C | 92.71 mm |
| May | 14.1 °C | 25.7 °C | 137.16 mm |
| June | 19.2 °C | 30.4 °C | 117.6 mm |
| July | 21.2 °C | 33.6 °C | 86.61 mm |
| August | 20.6 °C | 33.9 °C | 73.66 mm |
| September | 16.4 °C | 29.7 °C | 104.39 mm |
| October | 10.1 °C | 23.4 °C | 100.08 mm |
| November | 4.1 °C | 17.2 °C | 64.52 mm |
| December | -0.9 °C | 11.3 °C | 63.5 mm |
| Annual | 9.6 °C | 22.4 °C | 1023.37 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 50-75 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 | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |