Chester, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7.7 °C (low) to 22.1 °C (high). Annual precipitation averages 705.9 Millimeters. Chester is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.8 °C | 9.5 °C | 21.59 mm |
| February | -3.3 °C | 11.4 °C | 27.69 mm |
| March | 1.7 °C | 16.8 °C | 50.04 mm |
| April | 6.5 °C | 21.7 °C | 67.82 mm |
| May | 12.6 °C | 26.7 °C | 96.77 mm |
| June | 18.3 °C | 31.9 °C | 95 mm |
| July | 20.7 °C | 34.9 °C | 67.82 mm |
| August | 19.7 °C | 34.3 °C | 76.96 mm |
| September | 15.3 °C | 29.8 °C | 65.02 mm |
| October | 8 °C | 22.9 °C | 70.1 mm |
| November | 1.3 °C | 15.9 °C | 35.05 mm |
| December | -3.8 °C | 9.8 °C | 32 mm |
| Annual | 7.7 °C | 22.1 °C | 705.86 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 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 | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |