Berlin, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 36 °F (low) to 55.3 °F (high). Annual precipitation averages 33.9 Inches. 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 | 9.2 °F | 25.9 °F | 1.36 in. |
| February | 11.6 °F | 29.8 °F | 1.23 in. |
| March | 22.3 °F | 41.3 °F | 1.95 in. |
| April | 34.2 °F | 55.0 °F | 3.47 in. |
| May | 46.4 °F | 67.2 °F | 4.16 in. |
| June | 56.5 °F | 77.2 °F | 4.92 in. |
| July | 60.6 °F | 81.6 °F | 3.89 in. |
| August | 58.6 °F | 79.6 °F | 3.58 in. |
| September | 50.3 °F | 72.2 °F | 3.13 in. |
| October | 38.4 °F | 58.5 °F | 2.73 in. |
| November | 27.3 °F | 44.2 °F | 1.89 in. |
| December | 16.2 °F | 31.4 °F | 1.56 in. |
| Annual | 36 °F | 55.3 °F | 33.87 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 |