Frederick, South Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -0.1 °C (low) to 12 °C (high). Annual precipitation averages 565.7 Millimeters. Frederick is located in USDA Plant Hardiness Zone 4a. 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 | -16.9 °C | -6.3 °C | 12.7 mm |
| February | -14.5 °C | -3.4 °C | 14.73 mm |
| March | -7.7 °C | 3.6 °C | 23.88 mm |
| April | -0.4 °C | 12.5 °C | 43.43 mm |
| May | 6.9 °C | 19.8 °C | 83.06 mm |
| June | 12.9 °C | 25.1 °C | 96.77 mm |
| July | 15.3 °C | 28 °C | 87.38 mm |
| August | 13.8 °C | 27.3 °C | 62.48 mm |
| September | 8.5 °C | 22.6 °C | 57.91 mm |
| October | 1.1 °C | 14.1 °C | 50.04 mm |
| November | -6.6 °C | 4.3 °C | 17.53 mm |
| December | -13.1 °C | -3.3 °C | 15.75 mm |
| Annual | -0.1 °C | 12 °C | 565.66 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 4a : -34.4°C to -31.7°C |
| Plant Hardiness Zone - 2012 | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |