Washburn, Missouri has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7.4 °C (low) to 19.7 °C (high). Annual precipitation averages 1226.3 Millimeters. 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 | -4.6 °C | 6.9 °C | 76.2 mm |
| February | -2.8 °C | 9.4 °C | 60.96 mm |
| March | 1.8 °C | 14.4 °C | 104.14 mm |
| April | 6.7 °C | 19.6 °C | 124.97 mm |
| May | 12 °C | 23.9 °C | 146.3 mm |
| June | 17 °C | 28.6 °C | 114.05 mm |
| July | 19.2 °C | 31.1 °C | 105.41 mm |
| August | 18.3 °C | 31.1 °C | 83.31 mm |
| September | 13.9 °C | 27.2 °C | 123.19 mm |
| October | 7.8 °C | 21 °C | 104.65 mm |
| November | 2 °C | 14.3 °C | 97.54 mm |
| December | -2.8 °C | 8.5 °C | 85.6 mm |
| Annual | 7.4 °C | 19.7 °C | 1226.32 mm |
| 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 : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |