Owasso, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.1 °C (low) to 21.7 °C (high). Annual precipitation averages 1069.1 Millimeters. Owasso 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 | -3.6 °C | 8.8 °C | 44.2 mm |
| February | -1.7 °C | 11.4 °C | 48.26 mm |
| March | 3.2 °C | 16.5 °C | 82.55 mm |
| April | 8.4 °C | 21.6 °C | 113.79 mm |
| May | 14.4 °C | 25.8 °C | 150.11 mm |
| June | 19.5 °C | 30.7 °C | 124.46 mm |
| July | 21.8 °C | 33.6 °C | 98.55 mm |
| August | 20.7 °C | 33.5 °C | 90.42 mm |
| September | 15.9 °C | 29.1 °C | 96.27 mm |
| October | 9.1 °C | 22.9 °C | 90.42 mm |
| November | 2.9 °C | 16.1 °C | 73.15 mm |
| December | -1.8 °C | 10.2 °C | 56.9 mm |
| Annual | 9.1 °C | 21.7 °C | 1069.08 mm |
| 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 : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |