Redfield, South Dakota has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 0.5 °C (low) to 13 °C (high). Annual precipitation averages 575.8 Millimeters. Redfield 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 Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -15.8 °C | -5.1 °C | 11.94 mm |
| February | -13.4 °C | -2.1 °C | 17.53 mm |
| March | -6.8 °C | 5 °C | 23.62 mm |
| April | -0.1 °C | 13.3 °C | 54.61 mm |
| May | 7.2 °C | 20.3 °C | 85.09 mm |
| June | 13.3 °C | 25.8 °C | 97.54 mm |
| July | 16 °C | 29 °C | 86.36 mm |
| August | 14.4 °C | 28.1 °C | 61.21 mm |
| September | 9 °C | 23.4 °C | 54.86 mm |
| October | 1.4 °C | 14.9 °C | 52.07 mm |
| November | -6.2 °C | 5.7 °C | 16 mm |
| December | -12.6 °C | -2.2 °C | 14.99 mm |
| Annual | 0.5 °C | 13 °C | 575.82 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| 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 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |