Marklesburg, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 40.5 °F (low) to 61.3 °F (high). Annual precipitation averages 41.4 Inches. Marklesburg 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. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 20.0 °F | 36.7 °F | 2.84 in. |
| February | 21.0 °F | 39.8 °F | 2.37 in. |
| March | 27.6 °F | 48.3 °F | 3.29 in. |
| April | 38.0 °F | 61.5 °F | 3.6 in. |
| May | 48.3 °F | 71.6 °F | 4.11 in. |
| June | 57.2 °F | 79.4 °F | 4.02 in. |
| July | 61.5 °F | 84.0 °F | 3.63 in. |
| August | 60.0 °F | 82.6 °F | 3.76 in. |
| September | 53.0 °F | 75.6 °F | 4.09 in. |
| October | 41.6 °F | 63.8 °F | 3.49 in. |
| November | 32.2 °F | 51.7 °F | 3.0 in. |
| December | 25.1 °F | 40.7 °F | 3.18 in. |
| Annual | 40.5 °F | 61.3 °F | 41.38 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 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 | Dfb - Humid Continental Mild Summer, Wet All Year |