Prairie City, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.3 °C (low) to 15.4 °C (high). Annual precipitation averages 925.8 Millimeters. Prairie City 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 | -10.8 °C | -1 °C | 24.89 mm |
| February | -8.7 °C | 1.5 °C | 32 mm |
| March | -2.6 °C | 8.8 °C | 52.32 mm |
| April | 3.7 °C | 16.3 °C | 97.03 mm |
| May | 10.5 °C | 21.7 °C | 127.76 mm |
| June | 16.3 °C | 27.2 °C | 134.11 mm |
| July | 18.2 °C | 29.2 °C | 109.47 mm |
| August | 16.8 °C | 28.3 °C | 108.71 mm |
| September | 11.9 °C | 24.8 °C | 89.92 mm |
| October | 5.1 °C | 17.5 °C | 66.8 mm |
| November | -1.6 °C | 9.1 °C | 48.01 mm |
| December | -7.5 °C | 1.9 °C | 34.8 mm |
| Annual | 4.3 °C | 15.4 °C | 925.82 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°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 |