Prairie City, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 39.7 °F (low) to 59.8 °F (high). Annual precipitation averages 36.5 Inches. 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 | 12.6 °F | 30.2 °F | 0.98 in. |
| February | 16.3 °F | 34.7 °F | 1.26 in. |
| March | 27.3 °F | 47.8 °F | 2.06 in. |
| April | 38.7 °F | 61.4 °F | 3.82 in. |
| May | 50.9 °F | 71.1 °F | 5.03 in. |
| June | 61.3 °F | 81.0 °F | 5.28 in. |
| July | 64.7 °F | 84.5 °F | 4.31 in. |
| August | 62.2 °F | 82.9 °F | 4.28 in. |
| September | 53.5 °F | 76.6 °F | 3.54 in. |
| October | 41.1 °F | 63.5 °F | 2.63 in. |
| November | 29.1 °F | 48.4 °F | 1.89 in. |
| December | 18.5 °F | 35.4 °F | 1.37 in. |
| Annual | 39.7 °F | 59.8 °F | 36.45 in. |
| 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 : -15°F to -10°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 |