Preston, Minnesota has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 1.7 °C (low) to 12.8 °C (high). Annual precipitation averages 907.8 Millimeters. Preston is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -14.2 °C | -4.5 °C | 26.42 mm |
| February | -12.2 °C | -2.1 °C | 27.69 mm |
| March | -5.3 °C | 4.9 °C | 46.74 mm |
| April | 1.2 °C | 13.3 °C | 93.98 mm |
| May | 7.8 °C | 20 °C | 113.54 mm |
| June | 13.7 °C | 25.5 °C | 151.89 mm |
| July | 15.7 °C | 27.5 °C | 105.16 mm |
| August | 14.4 °C | 26.3 °C | 105.16 mm |
| September | 9.7 °C | 22.6 °C | 91.69 mm |
| October | 2.9 °C | 15.2 °C | 66.8 mm |
| November | -3.5 °C | 6.3 °C | 44.45 mm |
| December | -10.1 °C | -1.3 °C | 34.29 mm |
| Annual | 1.7 °C | 12.8 °C | 907.81 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| 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 | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |