Atlas, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 4.2 °C (low) to 15 °C (high). Annual precipitation averages 1265.2 Millimeters. Atlas 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 | 1.3 °C | 91.69 mm |
| February | -7.2 °C | 2.8 °C | 68.83 mm |
| March | -2.9 °C | 7.7 °C | 100.08 mm |
| April | 3.1 °C | 14.8 °C | 105.66 mm |
| May | 8.6 °C | 20.7 °C | 108.71 mm |
| June | 13.5 °C | 25.1 °C | 121.16 mm |
| July | 15.9 °C | 27.9 °C | 118.11 mm |
| August | 14.9 °C | 26.9 °C | 110.49 mm |
| September | 11.2 °C | 23.1 °C | 131.83 mm |
| October | 5.2 °C | 16.3 °C | 118.62 mm |
| November | -0.1 °C | 9.6 °C | 92.71 mm |
| December | -4.4 °C | 3.8 °C | 97.28 mm |
| Annual | 4.2 °C | 15 °C | 1265.17 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 100-125 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 | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |