Hartshorne, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 50.3 °F (low) to 72.8 °F (high). Annual precipitation averages 47.1 Inches. Hartshorne is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 28.6 °F | 51.0 °F | 2.64 in. |
| February | 32.4 °F | 55.1 °F | 2.58 in. |
| March | 40.7 °F | 64.0 °F | 3.86 in. |
| April | 48.9 °F | 72.4 °F | 4.81 in. |
| May | 59.0 °F | 79.3 °F | 6.05 in. |
| June | 67.6 °F | 87.7 °F | 4.63 in. |
| July | 71.3 °F | 93.0 °F | 3.62 in. |
| August | 69.8 °F | 93.2 °F | 3.17 in. |
| September | 62.2 °F | 86.2 °F | 4.28 in. |
| October | 50.6 °F | 75.0 °F | 4.25 in. |
| November | 40.3 °F | 63.4 °F | 3.72 in. |
| December | 31.6 °F | 53.3 °F | 3.49 in. |
| Annual | 50.3 °F | 72.8 °F | 47.1 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 7b : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7b : 5°F to 10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |