Reasnor, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.7 °C (low) to 15.7 °C (high). Annual precipitation averages 936.2 Millimeters. Reasnor 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 | -0.9 °C | 25.65 mm |
| February | -8.2 °C | 1.7 °C | 33.02 mm |
| March | -2.1 °C | 8.9 °C | 52.58 mm |
| April | 4.1 °C | 16.6 °C | 99.57 mm |
| May | 10.9 °C | 21.9 °C | 126.24 mm |
| June | 16.7 °C | 27.5 °C | 134.62 mm |
| July | 18.7 °C | 29.7 °C | 108.97 mm |
| August | 17.2 °C | 28.7 °C | 110.49 mm |
| September | 12.3 °C | 25.1 °C | 91.44 mm |
| October | 5.6 °C | 18 °C | 67.56 mm |
| November | -1.2 °C | 9.3 °C | 49.78 mm |
| December | -7 °C | 2.1 °C | 36.32 mm |
| Annual | 4.7 °C | 15.7 °C | 936.24 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 |