Hallstead, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.1 °C (low) to 14.5 °C (high). Annual precipitation averages 1111.3 Millimeters. Hallstead 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 | -9.1 °C | 0.1 °C | 72.14 mm |
| February | -8.7 °C | 1.3 °C | 57.91 mm |
| March | -4.7 °C | 6.3 °C | 80.77 mm |
| April | 1.2 °C | 14.1 °C | 95.25 mm |
| May | 7.4 °C | 20.8 °C | 97.28 mm |
| June | 12.6 °C | 25.5 °C | 115.82 mm |
| July | 15.1 °C | 27.6 °C | 108.71 mm |
| August | 14.4 °C | 26.9 °C | 112.78 mm |
| September | 10.6 °C | 22.9 °C | 105.16 mm |
| October | 4.3 °C | 16.2 °C | 103.63 mm |
| November | -0.9 °C | 8.6 °C | 80.01 mm |
| December | -5.1 °C | 3.1 °C | 81.79 mm |
| Annual | 3.1 °C | 14.5 °C | 1111.25 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| 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 |