Boswell, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 37.9 °F (low) to 57.5 °F (high). Annual precipitation averages 45.8 Inches. Boswell 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 16.6 °F | 33.5 °F | 3.47 in. |
| February | 18.5 °F | 36.2 °F | 2.94 in. |
| March | 24.8 °F | 44.7 °F | 3.94 in. |
| April | 36.5 °F | 58.2 °F | 3.9 in. |
| May | 46.2 °F | 67.9 °F | 4.63 in. |
| June | 54.6 °F | 75.1 °F | 4.6 in. |
| July | 58.6 °F | 78.9 °F | 4.21 in. |
| August | 57.0 °F | 77.7 °F | 4.05 in. |
| September | 49.8 °F | 71.4 °F | 3.86 in. |
| October | 39.6 °F | 59.9 °F | 3.32 in. |
| November | 29.9 °F | 48.1 °F | 3.3 in. |
| December | 23.0 °F | 37.9 °F | 3.53 in. |
| Annual | 37.9 °F | 57.5 °F | 45.75 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| 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 | Dfa - Humid Continental Hot Summers With Year Around Precipitation |