Parker, South Dakota has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 35.6 °F (low) to 57.1 °F (high). Annual precipitation averages 27.1 Inches. 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 | 7.3 °F | 26.0 °F | 0.55 in. |
| February | 11.5 °F | 31.0 °F | 0.76 in. |
| March | 22.7 °F | 43.3 °F | 1.35 in. |
| April | 34.3 °F | 57.6 °F | 2.88 in. |
| May | 47.3 °F | 69.9 °F | 3.79 in. |
| June | 58.6 °F | 79.9 °F | 4.26 in. |
| July | 62.3 °F | 84.6 °F | 3.1 in. |
| August | 59.8 °F | 81.8 °F | 3.33 in. |
| September | 50.6 °F | 74.9 °F | 2.8 in. |
| October | 36.9 °F | 60.8 °F | 2.38 in. |
| November | 23.4 °F | 44.3 °F | 1.05 in. |
| December | 12.7 °F | 30.5 °F | 0.8 in. |
| Annual | 35.6 °F | 57.1 °F | 27.05 in. |
| 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 : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |