Welling, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.6 °C (low) to 21.9 °C (high). Annual precipitation averages 1226 Millimeters. Welling 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 Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -2.4 °C | 9.6 °C | 64.26 mm |
| February | -0.5 °C | 12 °C | 62.99 mm |
| March | 4.2 °C | 16.9 °C | 99.31 mm |
| April | 8.9 °C | 22.1 °C | 116.84 mm |
| May | 14.3 °C | 26 °C | 160.27 mm |
| June | 19.3 °C | 30.5 °C | 130.56 mm |
| July | 21.6 °C | 33.3 °C | 100.84 mm |
| August | 20.7 °C | 33.3 °C | 90.42 mm |
| September | 16.4 °C | 29.3 °C | 117.09 mm |
| October | 9.9 °C | 23 °C | 113.79 mm |
| November | 4.1 °C | 16.6 °C | 95.5 mm |
| December | -0.8 °C | 10.7 °C | 74.17 mm |
| Annual | 9.6 °C | 21.9 °C | 1226.04 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 75-100 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 |