Stacyville, Iowa has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 35.3 °F (low) to 54.7 °F (high). Annual precipitation averages 36.9 Inches. Stacyville is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 6.5 °F | 23.3 °F | 1.03 in. |
| February | 10.5 °F | 27.7 °F | 1.13 in. |
| March | 22.6 °F | 40.3 °F | 1.91 in. |
| April | 34.6 °F | 55.7 °F | 3.89 in. |
| May | 46.9 °F | 68.1 °F | 5.05 in. |
| June | 57.6 °F | 77.9 °F | 5.56 in. |
| July | 61.0 °F | 81.1 °F | 4.68 in. |
| August | 58.4 °F | 78.9 °F | 4.13 in. |
| September | 49.8 °F | 72.8 °F | 3.6 in. |
| October | 37.3 °F | 59.2 °F | 2.73 in. |
| November | 25.1 °F | 42.7 °F | 1.76 in. |
| December | 13.6 °F | 29.0 °F | 1.43 in. |
| Annual | 35.3 °F | 54.7 °F | 36.9 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |