Berkley, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 38.3 °F (low) to 59.2 °F (high). Annual precipitation averages 35.8 Inches. 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 | 10.7 °F | 28.7 °F | 0.92 in. |
| February | 14.7 °F | 33.3 °F | 1.12 in. |
| March | 26.2 °F | 46.5 °F | 2.03 in. |
| April | 37.3 °F | 60.6 °F | 3.69 in. |
| May | 49.6 °F | 71.4 °F | 5.03 in. |
| June | 60.0 °F | 80.9 °F | 5.38 in. |
| July | 63.7 °F | 84.6 °F | 4.34 in. |
| August | 60.9 °F | 82.3 °F | 4.13 in. |
| September | 52.1 °F | 76.6 °F | 3.3 in. |
| October | 39.7 °F | 63.4 °F | 2.68 in. |
| November | 27.5 °F | 47.5 °F | 1.8 in. |
| December | 16.7 °F | 34.0 °F | 1.34 in. |
| Annual | 38.3 °F | 59.2 °F | 35.76 in. |
| 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 : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |