Hillsdale, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 46.7 °F (low) to 71.4 °F (high). Annual precipitation averages 32.8 Inches. Hillsdale 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 Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 23.7 °F | 47.3 °F | 0.98 in. |
| February | 26.9 °F | 51.6 °F | 1.26 in. |
| March | 35.7 °F | 61.5 °F | 2.36 in. |
| April | 44.2 °F | 70.5 °F | 3.22 in. |
| May | 55.6 °F | 79.8 °F | 4.41 in. |
| June | 65.8 °F | 90.0 °F | 4.58 in. |
| July | 70.1 °F | 95.2 °F | 3.45 in. |
| August | 68.5 °F | 93.6 °F | 3.72 in. |
| September | 60.5 °F | 85.9 °F | 2.57 in. |
| October | 47.6 °F | 73.3 °F | 3.15 in. |
| November | 35.5 °F | 60.0 °F | 1.65 in. |
| December | 26.1 °F | 48.6 °F | 1.4 in. |
| Annual | 46.7 °F | 71.4 °F | 32.75 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| 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 7a : 0°F to 5°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |