Hostetter, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.5 °C (low) to 16.1 °C (high). Annual precipitation averages 1197.9 Millimeters. Hostetter is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.7 °C | 2.7 °C | 91.19 mm |
| February | -6.2 °C | 4.3 °C | 74.42 mm |
| March | -2.3 °C | 9.3 °C | 93.73 mm |
| April | 3.3 °C | 16.4 °C | 102.11 mm |
| May | 9.1 °C | 21.8 °C | 113.79 mm |
| June | 13.8 °C | 25.9 °C | 125.98 mm |
| July | 16.1 °C | 28 °C | 126.49 mm |
| August | 15.2 °C | 27.4 °C | 101.09 mm |
| September | 11.3 °C | 23.9 °C | 104.39 mm |
| October | 4.9 °C | 17.4 °C | 85.85 mm |
| November | -0.2 °C | 10.8 °C | 89.41 mm |
| December | -3.8 °C | 5.1 °C | 89.41 mm |
| Annual | 4.5 °C | 16.1 °C | 1197.86 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |