Chester, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 45.8 °F (low) to 71.9 °F (high). Annual precipitation averages 27.8 Inches. 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 | 23.4 °F | 49.1 °F | 0.85 in. |
| February | 26.1 °F | 52.5 °F | 1.09 in. |
| March | 35.0 °F | 62.2 °F | 1.97 in. |
| April | 43.7 °F | 71.0 °F | 2.67 in. |
| May | 54.6 °F | 80.0 °F | 3.81 in. |
| June | 65.0 °F | 89.4 °F | 3.74 in. |
| July | 69.3 °F | 94.9 °F | 2.67 in. |
| August | 67.5 °F | 93.7 °F | 3.03 in. |
| September | 59.5 °F | 85.7 °F | 2.56 in. |
| October | 46.4 °F | 73.3 °F | 2.76 in. |
| November | 34.3 °F | 60.7 °F | 1.38 in. |
| December | 25.1 °F | 49.7 °F | 1.26 in. |
| Annual | 45.8 °F | 71.9 °F | 27.79 in. |
| 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 : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |