Hayfield, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 35.4 °F (low) to 53.6 °F (high). Annual precipitation averages 35.5 Inches. Hayfield is located in USDA Plant Hardiness Zone 5a. 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 | 6.4 °F | 22.1 °F | 0.99 in. |
| February | 10.0 °F | 26.4 °F | 0.98 in. |
| March | 22.2 °F | 38.8 °F | 1.86 in. |
| April | 34.8 °F | 54.3 °F | 3.52 in. |
| May | 47.2 °F | 67.0 °F | 4.65 in. |
| June | 57.9 °F | 77.0 °F | 5.72 in. |
| July | 61.2 °F | 80.0 °F | 4.54 in. |
| August | 58.5 °F | 77.9 °F | 4.22 in. |
| September | 50.2 °F | 71.7 °F | 3.71 in. |
| October | 37.6 °F | 57.9 °F | 2.51 in. |
| November | 25.5 °F | 41.7 °F | 1.58 in. |
| December | 13.5 °F | 27.9 °F | 1.25 in. |
| Annual | 35.4 °F | 53.6 °F | 35.53 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 5a : -20°F to -15°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 |