Osage, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.2 °C (low) to 22.3 °C (high). Annual precipitation averages 1022.1 Millimeters. Osage 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 | -3.4 °C | 9.6 °C | 39.12 mm |
| February | -1.3 °C | 12.2 °C | 42.67 mm |
| March | 3.6 °C | 17.3 °C | 76.71 mm |
| April | 8.7 °C | 22.7 °C | 109.22 mm |
| May | 14.2 °C | 26.3 °C | 141.22 mm |
| June | 19.2 °C | 31.1 °C | 118.62 mm |
| July | 21.5 °C | 33.9 °C | 100.84 mm |
| August | 20.6 °C | 33.9 °C | 98.04 mm |
| September | 15.8 °C | 29.4 °C | 97.79 mm |
| October | 9.2 °C | 23.6 °C | 88.9 mm |
| November | 3.3 °C | 16.5 °C | 60.71 mm |
| December | -1.6 °C | 10.6 °C | 48.26 mm |
| Annual | 9.2 °C | 22.3 °C | 1022.1 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 7a : -17.8°C to -15°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 |