Atlantic, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.8 °C (low) to 14.7 °C (high). Annual precipitation averages 1136.4 Millimeters. Atlantic 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.1 °C | 0.7 °C | 82.04 mm |
| February | -7.9 °C | 2.1 °C | 58.93 mm |
| March | -3.7 °C | 7.2 °C | 78.49 mm |
| April | 2.4 °C | 14.8 °C | 102.87 mm |
| May | 8.3 °C | 20.8 °C | 102.36 mm |
| June | 13.2 °C | 25.3 °C | 121.92 mm |
| July | 15.4 °C | 27.3 °C | 117.6 mm |
| August | 14.4 °C | 26.5 °C | 100.08 mm |
| September | 10.9 °C | 23.2 °C | 109.22 mm |
| October | 5.1 °C | 16.4 °C | 94.74 mm |
| November | 0.1 °C | 9.3 °C | 83.31 mm |
| December | -4.4 °C | 3.3 °C | 84.84 mm |
| Annual | 3.8 °C | 14.7 °C | 1136.4 mm |
| 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 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |