Annville, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 43 °F (low) to 62.4 °F (high). Annual precipitation averages 46.1 Inches. Annville is located in USDA Plant Hardiness Zone 7a. 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 | 21.6 °F | 37.6 °F | 3.17 in. |
| February | 22.8 °F | 40.4 °F | 2.46 in. |
| March | 30.5 °F | 49.4 °F | 3.74 in. |
| April | 40.8 °F | 62.2 °F | 3.71 in. |
| May | 50.9 °F | 72.3 °F | 3.87 in. |
| June | 60.3 °F | 80.9 °F | 4.43 in. |
| July | 64.6 °F | 85.6 °F | 4.66 in. |
| August | 63.0 °F | 83.7 °F | 4.17 in. |
| September | 55.8 °F | 76.8 °F | 4.9 in. |
| October | 44.2 °F | 64.7 °F | 4.23 in. |
| November | 34.3 °F | 53.1 °F | 3.22 in. |
| December | 26.9 °F | 42.4 °F | 3.57 in. |
| Annual | 43 °F | 62.4 °F | 46.13 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 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |