New Berlin, Wisconsin has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 37.2 °F (low) to 56.2 °F (high). Annual precipitation averages 36.5 Inches. New Berlin is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 12.0 °F | 28.1 °F | 1.77 in. |
| February | 15.0 °F | 31.7 °F | 1.67 in. |
| March | 24.2 °F | 42.6 °F | 2.02 in. |
| April | 35.2 °F | 54.9 °F | 3.92 in. |
| May | 45.9 °F | 66.6 °F | 4.18 in. |
| June | 55.6 °F | 76.6 °F | 4.95 in. |
| July | 60.8 °F | 81.4 °F | 3.75 in. |
| August | 59.3 °F | 79.9 °F | 3.85 in. |
| September | 51.1 °F | 72.9 °F | 3.28 in. |
| October | 39.9 °F | 60.0 °F | 2.88 in. |
| November | 29.0 °F | 45.7 °F | 2.17 in. |
| December | 18.4 °F | 33.4 °F | 2.04 in. |
| Annual | 37.2 °F | 56.2 °F | 36.48 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |