Washburn, Missouri has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 45.3 °F (low) to 67.4 °F (high). Annual precipitation averages 48.3 Inches. Washburn is located in USDA Plant Hardiness Zone 7a. 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 | 23.7 °F | 44.5 °F | 3.0 in. |
| February | 27.0 °F | 48.9 °F | 2.4 in. |
| March | 35.2 °F | 58.0 °F | 4.1 in. |
| April | 44.1 °F | 67.3 °F | 4.92 in. |
| May | 53.6 °F | 75.0 °F | 5.76 in. |
| June | 62.6 °F | 83.4 °F | 4.49 in. |
| July | 66.5 °F | 87.9 °F | 4.15 in. |
| August | 65.0 °F | 88.0 °F | 3.28 in. |
| September | 57.1 °F | 81.0 °F | 4.85 in. |
| October | 46.0 °F | 69.8 °F | 4.12 in. |
| November | 35.6 °F | 57.7 °F | 3.84 in. |
| December | 27.0 °F | 47.3 °F | 3.37 in. |
| Annual | 45.3 °F | 67.4 °F | 48.28 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |