Westover, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 38.6 °F (low) to 59.1 °F (high). Annual precipitation averages 44.6 Inches. Westover is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 17.9 °F | 34.1 °F | 3.26 in. |
| February | 18.9 °F | 37.1 °F | 2.5 in. |
| March | 25.8 °F | 46.1 °F | 3.61 in. |
| April | 36.3 °F | 59.7 °F | 3.82 in. |
| May | 46.2 °F | 70.0 °F | 3.92 in. |
| June | 55.3 °F | 77.6 °F | 4.47 in. |
| July | 59.5 °F | 81.6 °F | 4.42 in. |
| August | 57.7 °F | 80.3 °F | 4.22 in. |
| September | 51.1 °F | 73.6 °F | 4.12 in. |
| October | 39.8 °F | 61.6 °F | 3.49 in. |
| November | 30.6 °F | 49.2 °F | 3.37 in. |
| December | 23.6 °F | 38.4 °F | 3.4 in. |
| Annual | 38.6 °F | 59.1 °F | 44.6 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |