Glen Rock, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 43.9 °F (low) to 63.6 °F (high). Annual precipitation averages 46.3 Inches. Glen Rock 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 | 23.2 °F | 39.7 °F | 3.34 in. |
| February | 24.5 °F | 42.7 °F | 2.77 in. |
| March | 31.5 °F | 51.4 °F | 4.05 in. |
| April | 41.8 °F | 63.9 °F | 3.63 in. |
| May | 51.4 °F | 73.3 °F | 4.06 in. |
| June | 60.7 °F | 81.4 °F | 3.92 in. |
| July | 65.1 °F | 85.7 °F | 4.39 in. |
| August | 63.3 °F | 84.0 °F | 4.02 in. |
| September | 56.5 °F | 77.5 °F | 5.0 in. |
| October | 45.2 °F | 65.7 °F | 4.1 in. |
| November | 35.3 °F | 54.5 °F | 3.26 in. |
| December | 28.0 °F | 43.9 °F | 3.73 in. |
| Annual | 43.9 °F | 63.6 °F | 46.27 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 | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |