Doniphan, Missouri has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.3 °C (low) to 20.6 °C (high). Annual precipitation averages 1318.8 Millimeters. Doniphan is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -3.7 °C | 7.1 °C | 89.41 mm |
| February | -2.1 °C | 9.9 °C | 84.58 mm |
| March | 2.5 °C | 15.2 °C | 115.57 mm |
| April | 8.1 °C | 21.3 °C | 143.76 mm |
| May | 13.4 °C | 25.7 °C | 146.81 mm |
| June | 18.4 °C | 30.2 °C | 88.39 mm |
| July | 20.4 °C | 32.1 °C | 121.67 mm |
| August | 19.4 °C | 31.7 °C | 98.81 mm |
| September | 14.7 °C | 28.1 °C | 95.25 mm |
| October | 7.8 °C | 22.1 °C | 102.62 mm |
| November | 2.3 °C | 14.7 °C | 123.95 mm |
| December | -1.9 °C | 8.6 °C | 107.95 mm |
| Annual | 8.3 °C | 20.6 °C | 1318.77 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 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 | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |