Preston, Minnesota has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 35 °F (low) to 55.1 °F (high). Annual precipitation averages 35.7 Inches. 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 | 6.5 °F | 23.9 °F | 1.04 in. |
| February | 10.1 °F | 28.3 °F | 1.09 in. |
| March | 22.5 °F | 40.9 °F | 1.84 in. |
| April | 34.2 °F | 55.9 °F | 3.7 in. |
| May | 46.1 °F | 68.0 °F | 4.47 in. |
| June | 56.6 °F | 77.9 °F | 5.98 in. |
| July | 60.3 °F | 81.5 °F | 4.14 in. |
| August | 57.9 °F | 79.3 °F | 4.14 in. |
| September | 49.5 °F | 72.7 °F | 3.61 in. |
| October | 37.2 °F | 59.3 °F | 2.63 in. |
| November | 25.7 °F | 43.3 °F | 1.75 in. |
| December | 13.8 °F | 29.7 °F | 1.35 in. |
| Annual | 35 °F | 55.1 °F | 35.74 in. |
| 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 : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |