Osborne, Kansas has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 41.4 °F (low) to 66.3 °F (high). Annual precipitation averages 26.9 Inches. 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 | 17.3 °F | 39.9 °F | 0.61 in. |
| February | 20.3 °F | 44.7 °F | 0.72 in. |
| March | 29.4 °F | 55.7 °F | 1.53 in. |
| April | 39.2 °F | 65.7 °F | 2.39 in. |
| May | 50.7 °F | 75.2 °F | 4.15 in. |
| June | 62.0 °F | 86.6 °F | 3.69 in. |
| July | 66.9 °F | 91.8 °F | 4.12 in. |
| August | 64.7 °F | 89.0 °F | 3.42 in. |
| September | 55.3 °F | 81.4 °F | 2.43 in. |
| October | 41.7 °F | 69.4 °F | 1.77 in. |
| November | 29.1 °F | 54.2 °F | 1.09 in. |
| December | 19.9 °F | 42.3 °F | 0.93 in. |
| Annual | 41.4 °F | 66.3 °F | 26.85 in. |
| 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 : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |