Telford, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.9 °C (low) to 17.2 °C (high). Annual precipitation averages 1235.2 Millimeters. Telford 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. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.8 °C | 3.7 °C | 85.34 mm |
| February | -5.1 °C | 5.3 °C | 74.17 mm |
| March | -1.1 °C | 10 °C | 100.08 mm |
| April | 4.6 °C | 16.9 °C | 99.06 mm |
| May | 10 °C | 22.3 °C | 107.95 mm |
| June | 15.2 °C | 27.2 °C | 114.3 mm |
| July | 17.9 °C | 29.9 °C | 119.13 mm |
| August | 17 °C | 28.8 °C | 109.73 mm |
| September | 13 °C | 25.2 °C | 117.35 mm |
| October | 6.4 °C | 18.4 °C | 111.51 mm |
| November | 1 °C | 12.2 °C | 83.57 mm |
| December | -2.8 °C | 6.5 °C | 113.03 mm |
| Annual | 5.9 °C | 17.2 °C | 1235.22 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |