Bethel, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.1 °C (low) to 12.4 °C (high). Annual precipitation averages 845.3 Millimeters. 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 | -15.3 °C | -5.2 °C | 20.83 mm |
| February | -13.4 °C | -2.3 °C | 21.59 mm |
| March | -6.6 °C | 4.8 °C | 40.13 mm |
| April | 0.6 °C | 12.9 °C | 75.18 mm |
| May | 7.6 °C | 20.2 °C | 112.52 mm |
| June | 13.2 °C | 25.1 °C | 119.38 mm |
| July | 15.9 °C | 27.6 °C | 115.57 mm |
| August | 14.4 °C | 26.4 °C | 109.73 mm |
| September | 9.8 °C | 22.1 °C | 86.61 mm |
| October | 2.8 °C | 14.2 °C | 71.12 mm |
| November | -4.2 °C | 5.2 °C | 42.67 mm |
| December | -11.2 °C | -2.4 °C | 29.97 mm |
| Annual | 1.1 °C | 12.4 °C | 845.3 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 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |