Bellevue, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 3.6 °C (low) to 14.8 °C (high). Annual precipitation averages 955 Millimeters. Bellevue 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -11.2 °C | -1.8 °C | 33.78 mm |
| February | -9.4 °C | 0.6 °C | 39.62 mm |
| March | -3.2 °C | 7.7 °C | 53.59 mm |
| April | 2.9 °C | 15.1 °C | 95.25 mm |
| May | 9.3 °C | 21.7 °C | 108.2 mm |
| June | 15.1 °C | 27.1 °C | 139.45 mm |
| July | 17.1 °C | 28.8 °C | 113.79 mm |
| August | 15.9 °C | 27.8 °C | 100.58 mm |
| September | 11.2 °C | 24.2 °C | 91.44 mm |
| October | 4.7 °C | 16.9 °C | 76.2 mm |
| November | -1.7 °C | 8.3 °C | 57.91 mm |
| December | -7.6 °C | 1.2 °C | 45.21 mm |
| Annual | 3.6 °C | 14.8 °C | 955.02 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| 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 |