York, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.5 °C (low) to 17.7 °C (high). Annual precipitation averages 1133.9 Millimeters. York 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. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.1 °C | 4.2 °C | 80.52 mm |
| February | -4.6 °C | 5.7 °C | 68.33 mm |
| March | -0.3 °C | 10.7 °C | 98.55 mm |
| April | 5.3 °C | 17.8 °C | 88.65 mm |
| May | 10.8 °C | 23.2 °C | 101.35 mm |
| June | 16.2 °C | 27.8 °C | 102.11 mm |
| July | 18.5 °C | 30.2 °C | 107.19 mm |
| August | 17.5 °C | 29.3 °C | 100.33 mm |
| September | 13.6 °C | 25.6 °C | 122.17 mm |
| October | 7.3 °C | 18.9 °C | 97.79 mm |
| November | 1.7 °C | 12.4 °C | 78.23 mm |
| December | -2.4 °C | 6.4 °C | 88.65 mm |
| Annual | 6.5 °C | 17.7 °C | 1133.87 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| 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 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 |