Chaska, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 36.4 °F (low) to 55.7 °F (high). Annual precipitation averages 32.2 Inches. 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 | 6.3 °F | 23.6 °F | 0.87 in. |
| February | 10.2 °F | 28.3 °F | 0.87 in. |
| March | 22.8 °F | 41.0 °F | 1.61 in. |
| April | 35.9 °F | 56.6 °F | 2.87 in. |
| May | 48.3 °F | 69.5 °F | 4.33 in. |
| June | 58.6 °F | 79.0 °F | 4.71 in. |
| July | 63.5 °F | 83.5 °F | 4.06 in. |
| August | 60.4 °F | 81.4 °F | 4.43 in. |
| September | 52.3 °F | 74.2 °F | 3.17 in. |
| October | 38.8 °F | 59.5 °F | 2.47 in. |
| November | 25.9 °F | 42.8 °F | 1.6 in. |
| December | 13.2 °F | 28.8 °F | 1.2 in. |
| Annual | 36.4 °F | 55.7 °F | 32.19 in. |
| 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 : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |