Portersville, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 39 °F (low) to 60.2 °F (high). Annual precipitation averages 42.5 Inches. Portersville is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 17.8 °F | 35.1 °F | 3.18 in. |
| February | 19.1 °F | 38.4 °F | 2.49 in. |
| March | 26.1 °F | 47.4 °F | 3.19 in. |
| April | 37.0 °F | 60.5 °F | 3.79 in. |
| May | 47.1 °F | 70.7 °F | 3.86 in. |
| June | 56.0 °F | 78.6 °F | 4.51 in. |
| July | 59.6 °F | 82.5 °F | 4.4 in. |
| August | 58.2 °F | 81.3 °F | 3.72 in. |
| September | 51.3 °F | 75.2 °F | 3.82 in. |
| October | 40.4 °F | 62.7 °F | 3.23 in. |
| November | 31.6 °F | 50.5 °F | 3.16 in. |
| December | 24.0 °F | 39.7 °F | 3.18 in. |
| Annual | 39 °F | 60.2 °F | 42.53 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |