Chester, South Dakota has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 1.3 °C (low) to 12.9 °C (high). Annual precipitation averages 694.4 Millimeters. Chester is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -14.6 °C | -4.5 °C | 14.99 mm |
| February | -12.3 °C | -1.8 °C | 21.59 mm |
| March | -5.9 °C | 5 °C | 34.29 mm |
| April | 0.8 °C | 13.1 °C | 75.69 mm |
| May | 7.8 °C | 19.9 °C | 91.19 mm |
| June | 14 °C | 25.6 °C | 105.66 mm |
| July | 16.2 °C | 28.2 °C | 84.84 mm |
| August | 14.8 °C | 26.6 °C | 84.58 mm |
| September | 9.7 °C | 22.8 °C | 76.96 mm |
| October | 2.3 °C | 15.2 °C | 52.58 mm |
| November | -5.3 °C | 5.9 °C | 27.94 mm |
| December | -11.5 °C | -1.8 °C | 24.13 mm |
| Annual | 1.3 °C | 12.9 °C | 694.44 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4b : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |