Osterdock, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 3.4 °C (low) to 14.3 °C (high). Annual precipitation averages 950 Millimeters. Osterdock is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -12.1 °C | -2.7 °C | 32.26 mm |
| February | -10.1 °C | -0.1 °C | 31.5 mm |
| March | -3.4 °C | 6.9 °C | 50.29 mm |
| April | 2.9 °C | 14.8 °C | 93.73 mm |
| May | 9.4 °C | 21.3 °C | 116.33 mm |
| June | 15.2 °C | 26.6 °C | 146.81 mm |
| July | 17.2 °C | 28.6 °C | 121.67 mm |
| August | 15.9 °C | 27.6 °C | 95.25 mm |
| September | 11.1 °C | 23.8 °C | 95.5 mm |
| October | 4.4 °C | 16.5 °C | 72.14 mm |
| November | -2.1 °C | 7.6 °C | 53.09 mm |
| December | -8.2 °C | 0.5 °C | 41.4 mm |
| Annual | 3.4 °C | 14.3 °C | 949.97 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| 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 |