Middleburg, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40.7 °F (low) to 61.4 °F (high). Annual precipitation averages 45.9 Inches. Middleburg is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 19.6 °F | 35.9 °F | 3.23 in. |
| February | 20.7 °F | 39.1 °F | 2.45 in. |
| March | 28.0 °F | 48.4 °F | 3.51 in. |
| April | 38.1 °F | 61.8 °F | 3.8 in. |
| May | 48.6 °F | 72.1 °F | 4.14 in. |
| June | 58.0 °F | 80.3 °F | 4.3 in. |
| July | 62.1 °F | 84.7 °F | 4.28 in. |
| August | 60.5 °F | 82.8 °F | 4.4 in. |
| September | 53.1 °F | 76.0 °F | 4.77 in. |
| October | 41.9 °F | 63.8 °F | 4.2 in. |
| November | 32.1 °F | 51.7 °F | 3.21 in. |
| December | 25.1 °F | 40.5 °F | 3.57 in. |
| Annual | 40.7 °F | 61.4 °F | 45.86 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |