Osborne, Kansas has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.2 °C (low) to 19.1 °C (high). Annual precipitation averages 682 Millimeters. Osborne is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.2 °C | 4.4 °C | 15.49 mm |
| February | -6.5 °C | 7.1 °C | 18.29 mm |
| March | -1.4 °C | 13.2 °C | 38.86 mm |
| April | 4 °C | 18.7 °C | 60.71 mm |
| May | 10.4 °C | 24 °C | 105.41 mm |
| June | 16.7 °C | 30.3 °C | 93.73 mm |
| July | 19.4 °C | 33.2 °C | 104.65 mm |
| August | 18.2 °C | 31.7 °C | 86.87 mm |
| September | 12.9 °C | 27.4 °C | 61.72 mm |
| October | 5.4 °C | 20.8 °C | 44.96 mm |
| November | -1.6 °C | 12.3 °C | 27.69 mm |
| December | -6.7 °C | 5.7 °C | 23.62 mm |
| Annual | 5.2 °C | 19.1 °C | 682 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |