Hallstead, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 37.6 °F (low) to 58 °F (high). Annual precipitation averages 43.8 Inches. 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 | 15.7 °F | 32.1 °F | 2.84 in. |
| February | 16.4 °F | 34.3 °F | 2.28 in. |
| March | 23.5 °F | 43.4 °F | 3.18 in. |
| April | 34.2 °F | 57.3 °F | 3.75 in. |
| May | 45.4 °F | 69.4 °F | 3.83 in. |
| June | 54.6 °F | 77.9 °F | 4.56 in. |
| July | 59.2 °F | 81.7 °F | 4.28 in. |
| August | 58.0 °F | 80.4 °F | 4.44 in. |
| September | 51.0 °F | 73.3 °F | 4.14 in. |
| October | 39.8 °F | 61.1 °F | 4.08 in. |
| November | 30.4 °F | 47.5 °F | 3.15 in. |
| December | 22.8 °F | 37.5 °F | 3.22 in. |
| Annual | 37.6 °F | 58 °F | 43.75 in. |
| 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 : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |