South Amana, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 39.1 °F (low) to 59.4 °F (high). Annual precipitation averages 37.1 Inches. South Amana 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. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 12.2 °F | 29.0 °F | 1.14 in. |
| February | 15.9 °F | 33.8 °F | 1.35 in. |
| March | 27.0 °F | 46.9 °F | 2.16 in. |
| April | 38.0 °F | 60.8 °F | 3.67 in. |
| May | 50.4 °F | 71.9 °F | 4.76 in. |
| June | 60.7 °F | 81.2 °F | 5.15 in. |
| July | 64.0 °F | 84.5 °F | 4.33 in. |
| August | 61.4 °F | 82.7 °F | 4.34 in. |
| September | 52.5 °F | 76.6 °F | 3.58 in. |
| October | 40.5 °F | 63.5 °F | 2.86 in. |
| November | 28.6 °F | 47.8 °F | 2.13 in. |
| December | 18.3 °F | 34.5 °F | 1.62 in. |
| Annual | 39.1 °F | 59.4 °F | 37.09 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 5b : -15°F to -10°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 |