Woolstock, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 36.7 °F (low) to 57.4 °F (high). Annual precipitation averages 35.9 Inches. 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 | 8.6 °F | 26.2 °F | 0.88 in. |
| February | 12.7 °F | 30.7 °F | 1.06 in. |
| March | 24.7 °F | 43.7 °F | 2.02 in. |
| April | 35.7 °F | 58.9 °F | 3.77 in. |
| May | 48.3 °F | 70.4 °F | 5.06 in. |
| June | 59.1 °F | 80.2 °F | 5.56 in. |
| July | 62.4 °F | 83.2 °F | 4.3 in. |
| August | 59.6 °F | 81.0 °F | 4.44 in. |
| September | 50.7 °F | 75.2 °F | 3.24 in. |
| October | 38.2 °F | 62.1 °F | 2.55 in. |
| November | 25.9 °F | 45.4 °F | 1.67 in. |
| December | 15.0 °F | 31.7 °F | 1.35 in. |
| Annual | 36.7 °F | 57.4 °F | 35.9 in. |
| 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 : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |