Chalfant, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 42 °F (low) to 62 °F (high). Annual precipitation averages 41.4 Inches. Chalfant is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 21.2 °F | 37.4 °F | 3.19 in. |
| February | 22.3 °F | 40.2 °F | 2.44 in. |
| March | 29.3 °F | 49.4 °F | 3.35 in. |
| April | 39.5 °F | 62.8 °F | 3.38 in. |
| May | 50.2 °F | 72.6 °F | 3.83 in. |
| June | 58.9 °F | 80.4 °F | 4.42 in. |
| July | 63.2 °F | 84.3 °F | 4.32 in. |
| August | 61.7 °F | 82.9 °F | 3.76 in. |
| September | 54.7 °F | 76.4 °F | 3.52 in. |
| October | 43.4 °F | 64.3 °F | 3.11 in. |
| November | 33.6 °F | 52.1 °F | 2.96 in. |
| December | 26.5 °F | 41.7 °F | 3.09 in. |
| Annual | 42 °F | 62 °F | 41.37 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| 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 |