Dexter, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 34.7 °F (low) to 53 °F (high). Annual precipitation averages 35.5 Inches. Dexter 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 | 6.0 °F | 21.6 °F | 1.01 in. |
| February | 9.8 °F | 26.1 °F | 0.98 in. |
| March | 21.4 °F | 38.4 °F | 1.79 in. |
| April | 33.9 °F | 53.6 °F | 3.63 in. |
| May | 46.5 °F | 66.4 °F | 4.71 in. |
| June | 57.3 °F | 76.4 °F | 5.46 in. |
| July | 60.3 °F | 79.5 °F | 4.46 in. |
| August | 57.7 °F | 77.4 °F | 4.25 in. |
| September | 49.4 °F | 71.3 °F | 3.78 in. |
| October | 36.9 °F | 57.2 °F | 2.63 in. |
| November | 24.6 °F | 41.1 °F | 1.53 in. |
| December | 12.8 °F | 27.4 °F | 1.31 in. |
| Annual | 34.7 °F | 53 °F | 35.54 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| 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 | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |