Dallas, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 38.1 °F (low) to 58.2 °F (high). Annual precipitation averages 47.5 Inches. Dallas is located in USDA Plant Hardiness Zone 6a. 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 | 16.2 °F | 33.2 °F | 3.51 in. |
| February | 17.6 °F | 35.7 °F | 2.56 in. |
| March | 25.1 °F | 44.1 °F | 3.32 in. |
| April | 35.8 °F | 57.7 °F | 4.15 in. |
| May | 46.2 °F | 68.9 °F | 3.94 in. |
| June | 55.2 °F | 76.9 °F | 5.03 in. |
| July | 59.4 °F | 81.6 °F | 4.47 in. |
| August | 57.8 °F | 79.6 °F | 4.36 in. |
| September | 50.8 °F | 72.9 °F | 4.76 in. |
| October | 39.9 °F | 60.5 °F | 4.59 in. |
| November | 30.9 °F | 48.8 °F | 3.15 in. |
| December | 22.8 °F | 38.2 °F | 3.62 in. |
| Annual | 38.1 °F | 58.2 °F | 47.46 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 6a : -10°F to -5°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 |