Martinsburg, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 43.7 °F (low) to 64.3 °F (high). Annual precipitation averages 41.7 Inches. 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 | 19.6 °F | 37.4 °F | 2.45 in. |
| February | 22.8 °F | 42.1 °F | 2.43 in. |
| March | 32.1 °F | 53.4 °F | 3.07 in. |
| April | 42.9 °F | 65.3 °F | 4.28 in. |
| May | 53.6 °F | 74.5 °F | 4.59 in. |
| June | 62.8 °F | 83.2 °F | 4.74 in. |
| July | 66.5 °F | 86.9 °F | 4.54 in. |
| August | 64.8 °F | 86.6 °F | 3.61 in. |
| September | 56.2 °F | 79.5 °F | 3.64 in. |
| October | 44.3 °F | 67.3 °F | 3.19 in. |
| November | 33.7 °F | 53.7 °F | 2.86 in. |
| December | 24.6 °F | 41.6 °F | 2.28 in. |
| Annual | 43.7 °F | 64.3 °F | 41.68 in. |
| 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 : -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 |