West Middletown, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40.8 °F (low) to 61.2 °F (high). Annual precipitation averages 42.1 Inches. 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 | 20.2 °F | 36.7 °F | 3.3 in. |
| February | 21.5 °F | 39.7 °F | 2.55 in. |
| March | 28.7 °F | 49.1 °F | 3.32 in. |
| April | 39.1 °F | 62.1 °F | 3.56 in. |
| May | 48.8 °F | 71.4 °F | 4.16 in. |
| June | 57.6 °F | 78.9 °F | 4.43 in. |
| July | 61.4 °F | 82.8 °F | 4.2 in. |
| August | 59.6 °F | 81.9 °F | 3.56 in. |
| September | 53.0 °F | 75.7 °F | 3.68 in. |
| October | 41.7 °F | 63.6 °F | 3.14 in. |
| November | 32.8 °F | 51.8 °F | 3.02 in. |
| December | 25.2 °F | 41.2 °F | 3.18 in. |
| Annual | 40.8 °F | 61.2 °F | 42.1 in. |
| 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 : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |