Osawatomie, Kansas has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 44.9 °F (low) to 66.5 °F (high). Annual precipitation averages 40.1 Inches. Osawatomie is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 20.8 °F | 40.9 °F | 1.24 in. |
| February | 24.5 °F | 45.3 °F | 1.59 in. |
| March | 33.7 °F | 56.7 °F | 2.44 in. |
| April | 43.8 °F | 66.9 °F | 3.87 in. |
| May | 54.6 °F | 75.3 °F | 5.92 in. |
| June | 64.5 °F | 84.4 °F | 5.57 in. |
| July | 68.4 °F | 89.6 °F | 4.01 in. |
| August | 66.4 °F | 88.8 °F | 3.91 in. |
| September | 57.3 °F | 81.3 °F | 4.55 in. |
| October | 45.4 °F | 69.4 °F | 3.13 in. |
| November | 34.1 °F | 55.6 °F | 2.23 in. |
| December | 24.9 °F | 44.2 °F | 1.68 in. |
| Annual | 44.9 °F | 66.5 °F | 40.14 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°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 |