Hereford, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 42 °F (low) to 62.4 °F (high). Annual precipitation averages 49.8 Inches. Hereford 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 21.0 °F | 38.0 °F | 3.51 in. |
| February | 22.4 °F | 40.8 °F | 2.81 in. |
| March | 29.6 °F | 49.4 °F | 3.91 in. |
| April | 39.8 °F | 62.0 °F | 3.86 in. |
| May | 49.6 °F | 71.8 °F | 4.15 in. |
| June | 58.8 °F | 80.6 °F | 4.82 in. |
| July | 63.6 °F | 85.3 °F | 5.09 in. |
| August | 62.0 °F | 83.4 °F | 4.62 in. |
| September | 54.6 °F | 76.8 °F | 5.08 in. |
| October | 43.0 °F | 64.7 °F | 4.4 in. |
| November | 33.3 °F | 53.3 °F | 3.44 in. |
| December | 26.4 °F | 43.0 °F | 4.12 in. |
| Annual | 42 °F | 62.4 °F | 49.81 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| 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 | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |