Berkley, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 3.5 °C (low) to 15.1 °C (high). Annual precipitation averages 908.3 Millimeters. Berkley is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -11.8 °C | -1.8 °C | 23.37 mm |
| February | -9.6 °C | 0.7 °C | 28.45 mm |
| March | -3.2 °C | 8.1 °C | 51.56 mm |
| April | 2.9 °C | 15.9 °C | 93.73 mm |
| May | 9.8 °C | 21.9 °C | 127.76 mm |
| June | 15.6 °C | 27.2 °C | 136.65 mm |
| July | 17.6 °C | 29.2 °C | 110.24 mm |
| August | 16.1 °C | 27.9 °C | 104.9 mm |
| September | 11.2 °C | 24.8 °C | 83.82 mm |
| October | 4.3 °C | 17.4 °C | 68.07 mm |
| November | -2.5 °C | 8.6 °C | 45.72 mm |
| December | -8.5 °C | 1.1 °C | 34.04 mm |
| Annual | 3.5 °C | 15.1 °C | 908.31 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 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 | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |