Owasa, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 37.1 °F (low) to 57.4 °F (high). Annual precipitation averages 36.9 Inches. Owasa 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 | 9.2 °F | 26.2 °F | 0.93 in. |
| February | 13.2 °F | 30.9 °F | 1.08 in. |
| March | 24.9 °F | 43.9 °F | 2.08 in. |
| April | 36.1 °F | 58.6 °F | 3.82 in. |
| May | 48.7 °F | 70.4 °F | 5.12 in. |
| June | 59.4 °F | 80.2 °F | 5.9 in. |
| July | 62.5 °F | 83.0 °F | 4.36 in. |
| August | 59.8 °F | 81.0 °F | 4.29 in. |
| September | 50.8 °F | 75.0 °F | 3.4 in. |
| October | 38.6 °F | 61.8 °F | 2.63 in. |
| November | 26.3 °F | 45.3 °F | 1.85 in. |
| December | 15.5 °F | 31.9 °F | 1.46 in. |
| Annual | 37.1 °F | 57.4 °F | 36.92 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 5a : -20°F to -15°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |