Girardville, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.8 °C (low) to 15.5 °C (high). Annual precipitation averages 1286 Millimeters. Girardville 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 | -8 °C | 1.7 °C | 91.44 mm |
| February | -7.3 °C | 3.2 °C | 70.36 mm |
| March | -3.1 °C | 7.9 °C | 98.04 mm |
| April | 2.9 °C | 15.3 °C | 105.66 mm |
| May | 8.1 °C | 21.2 °C | 111.25 mm |
| June | 13.2 °C | 25.6 °C | 123.7 mm |
| July | 15.4 °C | 28.3 °C | 123.44 mm |
| August | 14.4 °C | 27.3 °C | 112.01 mm |
| September | 10.6 °C | 23.6 °C | 132.84 mm |
| October | 4.6 °C | 16.9 °C | 122.94 mm |
| November | -0.4 °C | 10.1 °C | 94.23 mm |
| December | -4.6 °C | 4.3 °C | 100.08 mm |
| Annual | 3.8 °C | 15.5 °C | 1285.99 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 |