Byron, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 35.1 °F (low) to 53.8 °F (high). Annual precipitation averages 34.7 Inches. Byron 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 | 6.2 °F | 22.4 °F | 1.02 in. |
| February | 9.8 °F | 26.9 °F | 1.02 in. |
| March | 22.0 °F | 39.2 °F | 1.97 in. |
| April | 34.4 °F | 54.6 °F | 3.43 in. |
| May | 46.7 °F | 67.1 °F | 4.27 in. |
| June | 57.3 °F | 77.0 °F | 5.39 in. |
| July | 60.7 °F | 80.4 °F | 4.52 in. |
| August | 58.2 °F | 78.2 °F | 4.5 in. |
| September | 50.0 °F | 71.7 °F | 3.46 in. |
| October | 37.4 °F | 58.0 °F | 2.27 in. |
| November | 25.4 °F | 41.7 °F | 1.58 in. |
| December | 13.5 °F | 28.2 °F | 1.27 in. |
| Annual | 35.1 °F | 53.8 °F | 34.7 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 | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |