West Middletown, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.9 °C (low) to 16.3 °C (high). Annual precipitation averages 1069.3 Millimeters. West Middletown is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.6 °C | 2.6 °C | 83.82 mm |
| February | -5.8 °C | 4.3 °C | 64.77 mm |
| March | -1.8 °C | 9.5 °C | 84.33 mm |
| April | 3.9 °C | 16.7 °C | 90.42 mm |
| May | 9.3 °C | 21.9 °C | 105.66 mm |
| June | 14.2 °C | 26.1 °C | 112.52 mm |
| July | 16.3 °C | 28.2 °C | 106.68 mm |
| August | 15.3 °C | 27.7 °C | 90.42 mm |
| September | 11.7 °C | 24.3 °C | 93.47 mm |
| October | 5.4 °C | 17.6 °C | 79.76 mm |
| November | 0.4 °C | 11 °C | 76.71 mm |
| December | -3.8 °C | 5.1 °C | 80.77 mm |
| Annual | 4.9 °C | 16.3 °C | 1069.33 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| 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 |