Olin, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 3.5 °C (low) to 14.8 °C (high). Annual precipitation averages 978.7 Millimeters. Olin 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 | -11.4 °C | -2.1 °C | 34.04 mm |
| February | -9.4 °C | 0.4 °C | 39.62 mm |
| March | -3.1 °C | 7.8 °C | 59.18 mm |
| April | 2.9 °C | 15.7 °C | 96.27 mm |
| May | 9.5 °C | 21.8 °C | 116.59 mm |
| June | 15.2 °C | 26.9 °C | 135.38 mm |
| July | 17.1 °C | 28.7 °C | 114.05 mm |
| August | 15.7 °C | 27.7 °C | 110.74 mm |
| September | 10.9 °C | 24.3 °C | 93.98 mm |
| October | 4.3 °C | 17.1 °C | 77.22 mm |
| November | -2.2 °C | 8.4 °C | 57.4 mm |
| December | -7.9 °C | 1.1 °C | 44.2 mm |
| Annual | 3.5 °C | 14.8 °C | 978.67 mm |
| 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 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |