Osage, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 2.1 °C (low) to 12.8 °C (high). Annual precipitation averages 952 Millimeters. Osage 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 | -13.9 °C | -4.7 °C | 26.42 mm |
| February | -11.7 °C | -2.2 °C | 30.73 mm |
| March | -5 °C | 4.8 °C | 48.51 mm |
| April | 1.7 °C | 13.4 °C | 103.89 mm |
| May | 8.5 °C | 20.3 °C | 131.32 mm |
| June | 14.4 °C | 25.7 °C | 146.3 mm |
| July | 16.3 °C | 27.5 °C | 118.11 mm |
| August | 14.8 °C | 26.3 °C | 101.85 mm |
| September | 10.2 °C | 22.9 °C | 90.93 mm |
| October | 3.1 °C | 15.4 °C | 68.58 mm |
| November | -3.7 °C | 6.1 °C | 46.48 mm |
| December | -10.1 °C | -1.5 °C | 38.86 mm |
| Annual | 2.1 °C | 12.8 °C | 951.98 mm |
| 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 : -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 |