Parmelee, 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 15.9 °C (high). Annual precipitation averages 527.8 Millimeters. Parmelee is located in USDA Plant Hardiness Zone 5a. 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 | -10.6 °C | 1.8 °C | 11.68 mm |
| February | -9.2 °C | 3.8 °C | 16 mm |
| March | -4.6 °C | 9.3 °C | 28.96 mm |
| April | 0.6 °C | 14.4 °C | 61.47 mm |
| May | 6.6 °C | 20.2 °C | 86.11 mm |
| June | 12.6 °C | 26.3 °C | 88.14 mm |
| July | 16 °C | 30.8 °C | 65.79 mm |
| August | 14.8 °C | 30.2 °C | 52.32 mm |
| September | 9.5 °C | 25.3 °C | 41.15 mm |
| October | 2.2 °C | 16.7 °C | 44.2 mm |
| November | -4.3 °C | 9.1 °C | 17.78 mm |
| December | -9.2 °C | 2.7 °C | 14.22 mm |
| Annual | 2 °C | 15.9 °C | 527.82 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 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 | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |