Parker, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 39.2 °F (low) to 61.4 °F (high). Annual precipitation averages 43.6 Inches. Parker 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 | 18.6 °F | 35.6 °F | 3.18 in. |
| February | 19.3 °F | 38.6 °F | 2.53 in. |
| March | 26.3 °F | 48.0 °F | 3.31 in. |
| April | 36.0 °F | 62.4 °F | 3.82 in. |
| May | 46.7 °F | 73.0 °F | 3.66 in. |
| June | 56.1 °F | 80.5 °F | 5.03 in. |
| July | 60.1 °F | 84.1 °F | 4.56 in. |
| August | 58.8 °F | 83.2 °F | 3.83 in. |
| September | 51.9 °F | 76.6 °F | 3.95 in. |
| October | 40.7 °F | 64.3 °F | 3.24 in. |
| November | 31.6 °F | 50.8 °F | 3.25 in. |
| December | 24.4 °F | 39.9 °F | 3.27 in. |
| Annual | 39.2 °F | 61.4 °F | 43.63 in. |
| 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 : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |