Weston, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 38.2 °F (low) to 59.2 °F (high). Annual precipitation averages 49.2 Inches. Weston 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. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 16.8 °F | 34.3 °F | 3.47 in. |
| February | 18.1 °F | 37.0 °F | 2.67 in. |
| March | 25.6 °F | 45.4 °F | 3.58 in. |
| April | 36.1 °F | 59.1 °F | 4.1 in. |
| May | 46.0 °F | 69.9 °F | 4.31 in. |
| June | 54.9 °F | 77.6 °F | 4.9 in. |
| July | 59.2 °F | 82.4 °F | 4.72 in. |
| August | 57.4 °F | 80.5 °F | 4.25 in. |
| September | 50.5 °F | 73.7 °F | 5.06 in. |
| October | 39.7 °F | 62.2 °F | 4.72 in. |
| November | 30.8 °F | 49.5 °F | 3.62 in. |
| December | 23.1 °F | 39.2 °F | 3.77 in. |
| Annual | 38.2 °F | 59.2 °F | 49.17 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| 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 | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |