Parker, South Dakota has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 2 °C (low) to 13.9 °C (high). Annual precipitation averages 687.1 Millimeters. Parker is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -13.7 °C | -3.3 °C | 13.97 mm |
| February | -11.4 °C | -0.6 °C | 19.3 mm |
| March | -5.2 °C | 6.3 °C | 34.29 mm |
| April | 1.3 °C | 14.2 °C | 73.15 mm |
| May | 8.5 °C | 21.1 °C | 96.27 mm |
| June | 14.8 °C | 26.6 °C | 108.2 mm |
| July | 16.8 °C | 29.2 °C | 78.74 mm |
| August | 15.4 °C | 27.7 °C | 84.58 mm |
| September | 10.3 °C | 23.8 °C | 71.12 mm |
| October | 2.7 °C | 16 °C | 60.45 mm |
| November | -4.8 °C | 6.8 °C | 26.67 mm |
| December | -10.7 °C | -0.8 °C | 20.32 mm |
| Annual | 2 °C | 13.9 °C | 687.06 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°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 |