Swissvale, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 42.5 °F (low) to 61.8 °F (high). Annual precipitation averages 41.3 Inches. Swissvale is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 21.6 °F | 37.2 °F | 3.2 in. |
| February | 22.8 °F | 40.0 °F | 2.44 in. |
| March | 29.7 °F | 49.2 °F | 3.34 in. |
| April | 40.1 °F | 62.7 °F | 3.38 in. |
| May | 50.8 °F | 72.3 °F | 3.85 in. |
| June | 59.4 °F | 80.2 °F | 4.37 in. |
| July | 63.6 °F | 84.0 °F | 4.3 in. |
| August | 62.1 °F | 82.7 °F | 3.71 in. |
| September | 55.2 °F | 76.3 °F | 3.54 in. |
| October | 43.8 °F | 64.1 °F | 3.1 in. |
| November | 34.1 °F | 51.9 °F | 2.96 in. |
| December | 26.9 °F | 41.5 °F | 3.08 in. |
| Annual | 42.5 °F | 61.8 °F | 41.27 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |