Bethel, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 34 °F (low) to 54.3 °F (high). Annual precipitation averages 33.3 Inches. Bethel 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 | 4.4 °F | 22.6 °F | 0.82 in. |
| February | 7.8 °F | 27.8 °F | 0.85 in. |
| March | 20.1 °F | 40.6 °F | 1.58 in. |
| April | 33.0 °F | 55.3 °F | 2.96 in. |
| May | 45.6 °F | 68.3 °F | 4.43 in. |
| June | 55.8 °F | 77.2 °F | 4.7 in. |
| July | 60.6 °F | 81.7 °F | 4.55 in. |
| August | 58.0 °F | 79.5 °F | 4.32 in. |
| September | 49.7 °F | 71.8 °F | 3.41 in. |
| October | 37.1 °F | 57.5 °F | 2.8 in. |
| November | 24.5 °F | 41.4 °F | 1.68 in. |
| December | 11.8 °F | 27.7 °F | 1.18 in. |
| Annual | 34 °F | 54.3 °F | 33.28 in. |
| 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 : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4a : -30°F to -25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |