Chaska, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.4 °C (low) to 13.1 °C (high). Annual precipitation averages 817.6 Millimeters. Chaska 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -14.3 °C | -4.7 °C | 22.1 mm |
| February | -12.1 °C | -2.1 °C | 22.1 mm |
| March | -5.1 °C | 5 °C | 40.89 mm |
| April | 2.2 °C | 13.7 °C | 72.9 mm |
| May | 9.1 °C | 20.8 °C | 109.98 mm |
| June | 14.8 °C | 26.1 °C | 119.63 mm |
| July | 17.5 °C | 28.6 °C | 103.12 mm |
| August | 15.8 °C | 27.4 °C | 112.52 mm |
| September | 11.3 °C | 23.4 °C | 80.52 mm |
| October | 3.8 °C | 15.3 °C | 62.74 mm |
| November | -3.4 °C | 6 °C | 40.64 mm |
| December | -10.4 °C | -1.8 °C | 30.48 mm |
| Annual | 2.4 °C | 13.1 °C | 817.62 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| 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 | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |