Monument, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.6 °C (low) to 15.6 °C (high). Annual precipitation averages 1106.4 Millimeters. Monument is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.9 °C | 1.4 °C | 78.23 mm |
| February | -7.4 °C | 3.2 °C | 61.72 mm |
| March | -3.5 °C | 8.2 °C | 86.11 mm |
| April | 2.1 °C | 15.8 °C | 94.23 mm |
| May | 8 °C | 21.9 °C | 102.62 mm |
| June | 12.9 °C | 26.1 °C | 104.39 mm |
| July | 15.3 °C | 28.5 °C | 105.92 mm |
| August | 14.4 °C | 27.4 °C | 102.11 mm |
| September | 10.4 °C | 23.6 °C | 109.98 mm |
| October | 4.3 °C | 16.9 °C | 97.28 mm |
| November | -0.9 °C | 10 °C | 81.53 mm |
| December | -4.7 °C | 3.8 °C | 82.3 mm |
| Annual | 3.6 °C | 15.6 °C | 1106.42 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |