Blue Bell, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 7.1 °C (low) to 17.4 °C (high). Annual precipitation averages 1221.5 Millimeters. Blue Bell is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.7 °C | 4.2 °C | 86.11 mm |
| February | -3.8 °C | 5.7 °C | 71.88 mm |
| March | 0 °C | 10.3 °C | 104.9 mm |
| April | 5.6 °C | 17 °C | 95.5 mm |
| May | 11.2 °C | 22.4 °C | 103.63 mm |
| June | 16.4 °C | 27.4 °C | 111.51 mm |
| July | 19.4 °C | 29.9 °C | 118.11 mm |
| August | 18.4 °C | 29 °C | 121.16 mm |
| September | 14.4 °C | 25.4 °C | 112.27 mm |
| October | 7.8 °C | 18.6 °C | 103.12 mm |
| November | 2.3 °C | 12.5 °C | 82.55 mm |
| December | -1.8 °C | 6.9 °C | 110.74 mm |
| Annual | 7.1 °C | 17.4 °C | 1221.48 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |