Hamburg, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40.4 °F (low) to 62.6 °F (high). Annual precipitation averages 34.1 Inches. Hamburg is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 13.7 °F | 33.7 °F | 0.79 in. |
| February | 18.0 °F | 38.8 °F | 1.1 in. |
| March | 28.7 °F | 51.8 °F | 1.89 in. |
| April | 39.5 °F | 63.7 °F | 3.3 in. |
| May | 51.7 °F | 73.8 °F | 5.4 in. |
| June | 62.1 °F | 83.0 °F | 4.98 in. |
| July | 65.8 °F | 86.6 °F | 4.31 in. |
| August | 63.1 °F | 85.0 °F | 3.55 in. |
| September | 53.7 °F | 78.8 °F | 3.13 in. |
| October | 41.2 °F | 66.8 °F | 2.69 in. |
| November | 28.6 °F | 50.8 °F | 1.67 in. |
| December | 18.8 °F | 38.2 °F | 1.24 in. |
| Annual | 40.4 °F | 62.6 °F | 34.05 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |