Wister, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.6 °C (low) to 23 °C (high). Annual precipitation averages 1244.9 Millimeters. Wister 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 | -2.4 °C | 10.7 °C | 70.87 mm |
| February | -0.2 °C | 13.3 °C | 71.88 mm |
| March | 4.2 °C | 17.9 °C | 104.65 mm |
| April | 8.8 °C | 22.7 °C | 127 mm |
| May | 14.4 °C | 26.6 °C | 152.15 mm |
| June | 19.4 °C | 31.5 °C | 112.27 mm |
| July | 21.4 °C | 34.3 °C | 93.73 mm |
| August | 20.5 °C | 34.2 °C | 87.12 mm |
| September | 16.2 °C | 30.2 °C | 112.52 mm |
| October | 9.4 °C | 24.3 °C | 106.17 mm |
| November | 3.7 °C | 17.7 °C | 110.49 mm |
| December | -0.8 °C | 12.1 °C | 96.01 mm |
| Annual | 9.6 °C | 23 °C | 1244.86 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 |