Morton, Minnesota has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 1.3 °C (low) to 12.9 °C (high). Annual precipitation averages 757.9 Millimeters. Morton is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -15.3 °C | -5.1 °C | 18.29 mm |
| February | -13.1 °C | -2.6 °C | 20.07 mm |
| March | -6.3 °C | 4.4 °C | 41.15 mm |
| April | 0.7 °C | 13.2 °C | 71.88 mm |
| May | 8 °C | 20.6 °C | 99.82 mm |
| June | 14.1 °C | 26 °C | 122.17 mm |
| July | 16.1 °C | 28.5 °C | 92.96 mm |
| August | 14.7 °C | 27.3 °C | 97.28 mm |
| September | 9.8 °C | 23.3 °C | 78.49 mm |
| October | 2.7 °C | 15.2 °C | 58.67 mm |
| November | -4.6 °C | 5.8 °C | 31.5 mm |
| December | -11.3 °C | -2.3 °C | 25.65 mm |
| Annual | 1.3 °C | 12.9 °C | 757.93 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 150-180 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 | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |