Bartlesville, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.3 °C (low) to 21.4 °C (high). Annual precipitation averages 1007.9 Millimeters. Bartlesville 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 | -4.7 °C | 8.3 °C | 37.59 mm |
| February | -2.7 °C | 10.9 °C | 44.2 mm |
| March | 2.4 °C | 16.1 °C | 75.18 mm |
| April | 7.8 °C | 21.4 °C | 104.9 mm |
| May | 13.7 °C | 25.7 °C | 148.84 mm |
| June | 18.8 °C | 30.4 °C | 129.29 mm |
| July | 21.1 °C | 33.4 °C | 93.73 mm |
| August | 20 °C | 33.3 °C | 88.14 mm |
| September | 15.4 °C | 29.1 °C | 85.85 mm |
| October | 8.4 °C | 22.7 °C | 89.41 mm |
| November | 2.1 °C | 15.8 °C | 60.45 mm |
| December | -3.1 °C | 9.5 °C | 50.29 mm |
| Annual | 8.3 °C | 21.4 °C | 1007.87 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 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |