Gray, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 40.2 °F (low) to 60.7 °F (high). Annual precipitation averages 43.4 Inches. Gray 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 | 19.6 °F | 35.7 °F | 2.97 in. |
| February | 20.5 °F | 38.7 °F | 2.59 in. |
| March | 27.3 °F | 47.6 °F | 3.45 in. |
| April | 37.7 °F | 61.2 °F | 3.78 in. |
| May | 47.9 °F | 71.3 °F | 4.14 in. |
| June | 57.2 °F | 79.2 °F | 4.2 in. |
| July | 61.3 °F | 83.5 °F | 3.94 in. |
| August | 59.6 °F | 82.1 °F | 3.84 in. |
| September | 52.6 °F | 75.1 °F | 4.29 in. |
| October | 41.3 °F | 63.1 °F | 3.77 in. |
| November | 32.0 °F | 50.8 °F | 3.16 in. |
| December | 24.9 °F | 39.9 °F | 3.29 in. |
| Annual | 40.2 °F | 60.7 °F | 43.42 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 6b : -5°F to 0°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |