Chalfont, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 43.4 °F (low) to 63.7 °F (high). Annual precipitation averages 47.9 Inches. Chalfont is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 22.4 °F | 39.5 °F | 3.33 in. |
| February | 23.8 °F | 42.3 °F | 2.81 in. |
| March | 31.0 °F | 50.7 °F | 4.01 in. |
| April | 41.0 °F | 63.1 °F | 3.78 in. |
| May | 50.8 °F | 72.8 °F | 4.19 in. |
| June | 60.2 °F | 81.8 °F | 4.39 in. |
| July | 65.2 °F | 86.5 °F | 4.74 in. |
| August | 63.5 °F | 84.7 °F | 4.4 in. |
| September | 56.3 °F | 78.1 °F | 4.39 in. |
| October | 44.4 °F | 65.9 °F | 4.25 in. |
| November | 34.7 °F | 54.7 °F | 3.29 in. |
| December | 27.6 °F | 44.5 °F | 4.35 in. |
| Annual | 43.4 °F | 63.7 °F | 47.93 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |