Hawarden, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 36.2 °F (low) to 58.5 °F (high). Annual precipitation averages 29.3 Inches. Hawarden 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 | 8.3 °F | 27.6 °F | 0.69 in. |
| February | 12.5 °F | 32.7 °F | 0.8 in. |
| March | 23.8 °F | 45.4 °F | 1.68 in. |
| April | 35.1 °F | 59.6 °F | 3.13 in. |
| May | 47.4 °F | 71.0 °F | 4.16 in. |
| June | 58.9 °F | 81.1 °F | 4.5 in. |
| July | 62.6 °F | 85.0 °F | 3.12 in. |
| August | 60.0 °F | 83.0 °F | 3.2 in. |
| September | 50.3 °F | 76.2 °F | 3.12 in. |
| October | 37.3 °F | 62.5 °F | 2.51 in. |
| November | 24.1 °F | 46.0 °F | 1.34 in. |
| December | 13.5 °F | 32.0 °F | 1.0 in. |
| Annual | 36.2 °F | 58.5 °F | 29.25 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 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 | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |