Wheaton, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 0.2 °C (low) to 11.7 °C (high). Annual precipitation averages 643.4 Millimeters. Wheaton 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 | -17.1 °C | -6.8 °C | 18.29 mm |
| February | -15.2 °C | -4.4 °C | 16.76 mm |
| March | -7.6 °C | 2.8 °C | 28.45 mm |
| April | 0 °C | 12.2 °C | 58.42 mm |
| May | 7.3 °C | 19.9 °C | 74.68 mm |
| June | 13.6 °C | 25.3 °C | 105.41 mm |
| July | 15.7 °C | 27.7 °C | 97.03 mm |
| August | 14 °C | 26.7 °C | 71.12 mm |
| September | 8.9 °C | 22.4 °C | 67.06 mm |
| October | 1.9 °C | 14 °C | 60.96 mm |
| November | -5.7 °C | 4.4 °C | 25.15 mm |
| December | -12.9 °C | -3.6 °C | 20.07 mm |
| Annual | 0.2 °C | 11.7 °C | 643.4 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 | Dfb - Humid Continental Mild Summer, Wet All Year |