Gilberton, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.8 °C (low) to 15.2 °C (high). Annual precipitation averages 1306.6 Millimeters. Gilberton is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.1 °C | 1.4 °C | 92.46 mm |
| February | -7.4 °C | 2.9 °C | 72.39 mm |
| March | -3.2 °C | 7.7 °C | 96.27 mm |
| April | 2.8 °C | 15.1 °C | 107.19 mm |
| May | 7.9 °C | 21 °C | 115.57 mm |
| June | 13.1 °C | 25.3 °C | 127.76 mm |
| July | 15.4 °C | 28 °C | 125.98 mm |
| August | 14.4 °C | 27 °C | 114.3 mm |
| September | 10.7 °C | 23.2 °C | 133.86 mm |
| October | 4.7 °C | 16.8 °C | 124.46 mm |
| November | -0.4 °C | 9.9 °C | 94.23 mm |
| December | -4.7 °C | 4.1 °C | 102.11 mm |
| Annual | 3.8 °C | 15.2 °C | 1306.58 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| 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 |