Berlin, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 43.2 °F (low) to 63.2 °F (high). Annual precipitation averages 39 Inches. Berlin is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 18.9 °F | 35.2 °F | 2.1 in. |
| February | 22.3 °F | 40.3 °F | 1.9 in. |
| March | 31.5 °F | 51.8 °F | 2.74 in. |
| April | 42.1 °F | 64.5 °F | 4.09 in. |
| May | 53.7 °F | 74.3 °F | 4.68 in. |
| June | 62.9 °F | 82.7 °F | 4.63 in. |
| July | 66.0 °F | 85.6 °F | 3.83 in. |
| August | 63.8 °F | 84.6 °F | 3.38 in. |
| September | 55.4 °F | 79.4 °F | 3.34 in. |
| October | 43.9 °F | 67.0 °F | 3.12 in. |
| November | 33.2 °F | 52.3 °F | 2.99 in. |
| December | 24.2 °F | 40.4 °F | 2.19 in. |
| Annual | 43.2 °F | 63.2 °F | 38.99 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |