Martinsburg, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.5 °C (low) to 17.9 °C (high). Annual precipitation averages 1058.7 Millimeters. Martinsburg is located in USDA Plant Hardiness Zone 6b. 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 | -6.9 °C | 3 °C | 62.23 mm |
| February | -5.1 °C | 5.6 °C | 61.72 mm |
| March | 0.1 °C | 11.9 °C | 77.98 mm |
| April | 6.1 °C | 18.5 °C | 108.71 mm |
| May | 12 °C | 23.6 °C | 116.59 mm |
| June | 17.1 °C | 28.4 °C | 120.4 mm |
| July | 19.2 °C | 30.5 °C | 115.32 mm |
| August | 18.2 °C | 30.3 °C | 91.69 mm |
| September | 13.4 °C | 26.4 °C | 92.46 mm |
| October | 6.8 °C | 19.6 °C | 81.03 mm |
| November | 0.9 °C | 12.1 °C | 72.64 mm |
| December | -4.1 °C | 5.3 °C | 57.91 mm |
| Annual | 6.5 °C | 17.9 °C | 1058.68 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |