Dyersville, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 36.4 °F (low) to 56.9 °F (high). Annual precipitation averages 38.8 Inches. Dyersville 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 | 9.1 °F | 26.4 °F | 1.24 in. |
| February | 12.8 °F | 30.9 °F | 1.39 in. |
| March | 24.5 °F | 44.0 °F | 2.13 in. |
| April | 35.5 °F | 57.9 °F | 3.87 in. |
| May | 47.3 °F | 69.5 °F | 4.58 in. |
| June | 57.7 °F | 79.0 °F | 5.84 in. |
| July | 61.1 °F | 82.1 °F | 4.77 in. |
| August | 58.8 °F | 80.4 °F | 4.25 in. |
| September | 49.9 °F | 73.8 °F | 3.76 in. |
| October | 38.1 °F | 60.8 °F | 3.02 in. |
| November | 26.5 °F | 45.2 °F | 2.24 in. |
| December | 15.9 °F | 32.2 °F | 1.68 in. |
| Annual | 36.4 °F | 56.9 °F | 38.77 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| 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 | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |