Berlin, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.2 °C (low) to 13 °C (high). Annual precipitation averages 860.3 Millimeters. Berlin 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 | -12.7 °C | -3.4 °C | 34.54 mm |
| February | -11.3 °C | -1.2 °C | 31.24 mm |
| March | -5.4 °C | 5.2 °C | 49.53 mm |
| April | 1.2 °C | 12.8 °C | 88.14 mm |
| May | 8 °C | 19.6 °C | 105.66 mm |
| June | 13.6 °C | 25.1 °C | 124.97 mm |
| July | 15.9 °C | 27.6 °C | 98.81 mm |
| August | 14.8 °C | 26.4 °C | 90.93 mm |
| September | 10.2 °C | 22.3 °C | 79.5 mm |
| October | 3.6 °C | 14.7 °C | 69.34 mm |
| November | -2.6 °C | 6.8 °C | 48.01 mm |
| December | -8.8 °C | -0.3 °C | 39.62 mm |
| Annual | 2.2 °C | 13 °C | 860.29 mm |
| 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 : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |