Woolstock, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 2.6 °C (low) to 14.1 °C (high). Annual precipitation averages 911.9 Millimeters. Woolstock 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. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -13 °C | -3.2 °C | 22.35 mm |
| February | -10.7 °C | -0.7 °C | 26.92 mm |
| March | -4.1 °C | 6.5 °C | 51.31 mm |
| April | 2.1 °C | 14.9 °C | 95.76 mm |
| May | 9.1 °C | 21.3 °C | 128.52 mm |
| June | 15.1 °C | 26.8 °C | 141.22 mm |
| July | 16.9 °C | 28.4 °C | 109.22 mm |
| August | 15.3 °C | 27.2 °C | 112.78 mm |
| September | 10.4 °C | 24 °C | 82.3 mm |
| October | 3.4 °C | 16.7 °C | 64.77 mm |
| November | -3.4 °C | 7.4 °C | 42.42 mm |
| December | -9.4 °C | -0.2 °C | 34.29 mm |
| Annual | 2.6 °C | 14.1 °C | 911.86 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| 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 |