Nowthen, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 34.4 °F (low) to 54.2 °F (high). Annual precipitation averages 33 Inches. Nowthen 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 | 4.6 °F | 22.3 °F | 0.82 in. |
| February | 8.0 °F | 27.2 °F | 0.87 in. |
| March | 20.3 °F | 40.2 °F | 1.59 in. |
| April | 33.3 °F | 55.0 °F | 2.9 in. |
| May | 46.1 °F | 68.2 °F | 4.35 in. |
| June | 56.5 °F | 77.5 °F | 4.53 in. |
| July | 61.1 °F | 82.1 °F | 4.55 in. |
| August | 58.4 °F | 79.6 °F | 4.23 in. |
| September | 50.1 °F | 71.9 °F | 3.6 in. |
| October | 37.3 °F | 57.3 °F | 2.77 in. |
| November | 24.7 °F | 41.3 °F | 1.65 in. |
| December | 11.9 °F | 27.4 °F | 1.13 in. |
| Annual | 34.4 °F | 54.2 °F | 32.99 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 | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |