Pella, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.5 °C (low) to 15.6 °C (high). Annual precipitation averages 950.7 Millimeters. Pella is located in USDA Plant Hardiness Zone 5b. 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 | -10.3 °C | -0.8 °C | 26.42 mm |
| February | -8.3 °C | 1.8 °C | 34.54 mm |
| March | -2.3 °C | 9 °C | 53.09 mm |
| April | 3.9 °C | 16.3 °C | 104.39 mm |
| May | 10.7 °C | 22 °C | 127 mm |
| June | 16.4 °C | 27.4 °C | 135.38 mm |
| July | 18.3 °C | 29.6 °C | 109.73 mm |
| August | 16.9 °C | 28.4 °C | 112.27 mm |
| September | 12.1 °C | 24.9 °C | 91.95 mm |
| October | 5.3 °C | 17.9 °C | 67.56 mm |
| November | -1.3 °C | 9.1 °C | 50.29 mm |
| December | -7.2 °C | 2.1 °C | 38.1 mm |
| Annual | 4.5 °C | 15.6 °C | 950.72 mm |
| 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 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |