Upper Exeter, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 39.6 °F (low) to 60 °F (high). Annual precipitation averages 43.3 Inches. Upper Exeter 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 18.1 °F | 34.7 °F | 2.91 in. |
| February | 19.1 °F | 37.3 °F | 2.32 in. |
| March | 26.7 °F | 45.9 °F | 3.2 in. |
| April | 36.9 °F | 59.3 °F | 3.67 in. |
| May | 47.6 °F | 70.8 °F | 3.7 in. |
| June | 56.6 °F | 78.9 °F | 4.56 in. |
| July | 60.9 °F | 83.7 °F | 4.39 in. |
| August | 59.3 °F | 81.7 °F | 4.26 in. |
| September | 52.3 °F | 74.7 °F | 4.14 in. |
| October | 41.2 °F | 62.5 °F | 4.03 in. |
| November | 32.4 °F | 50.8 °F | 2.9 in. |
| December | 24.4 °F | 40.0 °F | 3.2 in. |
| Annual | 39.6 °F | 60 °F | 43.28 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |