New London, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 33.5 °F (low) to 53.3 °F (high). Annual precipitation averages 30.3 Inches. New London 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 | 2.8 °F | 20.6 °F | 0.82 in. |
| February | 6.2 °F | 25.5 °F | 0.88 in. |
| March | 19.0 °F | 38.0 °F | 1.6 in. |
| April | 32.8 °F | 54.4 °F | 2.68 in. |
| May | 45.8 °F | 67.8 °F | 3.44 in. |
| June | 56.5 °F | 77.3 °F | 4.87 in. |
| July | 61.0 °F | 81.6 °F | 4.16 in. |
| August | 58.2 °F | 79.3 °F | 3.96 in. |
| September | 49.7 °F | 72.0 °F | 2.98 in. |
| October | 36.6 °F | 57.0 °F | 2.53 in. |
| November | 23.2 °F | 39.6 °F | 1.43 in. |
| December | 10.2 °F | 25.9 °F | 0.98 in. |
| Annual | 33.5 °F | 53.3 °F | 30.33 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 |