New London, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 35.7 °F (low) to 55.1 °F (high). Annual precipitation averages 34 Inches. New London is located in USDA Plant Hardiness Zone 5a. 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 | 9.5 °F | 25.5 °F | 1.35 in. |
| February | 11.4 °F | 29.3 °F | 1.21 in. |
| March | 21.7 °F | 40.6 °F | 1.91 in. |
| April | 33.7 °F | 54.5 °F | 3.25 in. |
| May | 45.9 °F | 67.5 °F | 3.87 in. |
| June | 56.2 °F | 77.2 °F | 4.68 in. |
| July | 60.1 °F | 81.4 °F | 3.99 in. |
| August | 58.3 °F | 79.5 °F | 3.78 in. |
| September | 49.9 °F | 72.4 °F | 3.37 in. |
| October | 38.3 °F | 58.4 °F | 2.94 in. |
| November | 27.4 °F | 43.8 °F | 1.85 in. |
| December | 16.2 °F | 30.9 °F | 1.78 in. |
| Annual | 35.7 °F | 55.1 °F | 33.98 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 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |