Oto, 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 59.9 °F (high). Annual precipitation averages 31.4 Inches. Oto 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 | 10.0 °F | 29.3 °F | 0.7 in. |
| February | 14.3 °F | 34.3 °F | 0.88 in. |
| March | 25.2 °F | 47.7 °F | 1.67 in. |
| April | 35.8 °F | 61.3 °F | 3.31 in. |
| May | 48.2 °F | 72.3 °F | 4.41 in. |
| June | 59.1 °F | 82.2 °F | 4.78 in. |
| July | 62.8 °F | 85.4 °F | 3.75 in. |
| August | 60.1 °F | 83.1 °F | 4.16 in. |
| September | 51.0 °F | 77.2 °F | 3.0 in. |
| October | 38.1 °F | 64.2 °F | 2.24 in. |
| November | 25.1 °F | 47.7 °F | 1.4 in. |
| December | 15.1 °F | 34.2 °F | 1.08 in. |
| Annual | 37.1 °F | 59.9 °F | 31.38 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 |