Sergeant Bluff, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 3 °C (low) to 15.5 °C (high). Annual precipitation averages 751.8 Millimeters. Sergeant Bluff 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 | -12.2 °C | -1.4 °C | 15.49 mm |
| February | -9.8 °C | 1.3 °C | 20.57 mm |
| March | -3.7 °C | 8.7 °C | 41.15 mm |
| April | 2.4 °C | 16.1 °C | 81.03 mm |
| May | 9.3 °C | 22.3 °C | 103.38 mm |
| June | 15.4 °C | 27.9 °C | 115.82 mm |
| July | 17.4 °C | 29.7 °C | 85.09 mm |
| August | 16.1 °C | 28.5 °C | 95.76 mm |
| September | 10.8 °C | 25 °C | 73.41 mm |
| October | 3.6 °C | 17.7 °C | 58.67 mm |
| November | -3.6 °C | 8.7 °C | 37.08 mm |
| December | -9.3 °C | 1.2 °C | 24.38 mm |
| Annual | 3 °C | 15.5 °C | 751.83 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 150-180 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 | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |