Delano, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2 °C (low) to 12.4 °C (high). Annual precipitation averages 794 Millimeters. Delano is located in USDA Plant Hardiness Zone 4b. 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 | -14.8 °C | -5.2 °C | 19.56 mm |
| February | -12.9 °C | -2.6 °C | 21.59 mm |
| March | -5.9 °C | 4.4 °C | 36.32 mm |
| April | 1.4 °C | 12.7 °C | 72.14 mm |
| May | 8.6 °C | 20 °C | 107.19 mm |
| June | 14.5 °C | 25.3 °C | 120.65 mm |
| July | 17 °C | 27.9 °C | 99.31 mm |
| August | 15.6 °C | 26.6 °C | 105.66 mm |
| September | 10.9 °C | 22.4 °C | 84.07 mm |
| October | 3.6 °C | 14.3 °C | 62.23 mm |
| November | -3.6 °C | 5.3 °C | 36.58 mm |
| December | -10.8 °C | -2.4 °C | 28.7 mm |
| Annual | 2 °C | 12.4 °C | 794 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 4b : -31.7°C to -28.9°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 |