Plum, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 41.2 °F (low) to 61.6 °F (high). Annual precipitation averages 43.5 Inches. Plum 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 | 20.2 °F | 36.5 °F | 3.43 in. |
| February | 21.3 °F | 39.6 °F | 2.67 in. |
| March | 28.4 °F | 48.7 °F | 3.34 in. |
| April | 38.8 °F | 62.5 °F | 3.56 in. |
| May | 49.6 °F | 72.3 °F | 4.07 in. |
| June | 58.1 °F | 80.2 °F | 4.49 in. |
| July | 62.3 °F | 83.7 °F | 4.52 in. |
| August | 60.6 °F | 82.5 °F | 3.82 in. |
| September | 53.7 °F | 76.2 °F | 3.8 in. |
| October | 42.5 °F | 64.0 °F | 3.23 in. |
| November | 33.0 °F | 51.5 °F | 3.19 in. |
| December | 25.8 °F | 41.0 °F | 3.34 in. |
| Annual | 41.2 °F | 61.6 °F | 43.46 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| 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 |