Gratz, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40.6 °F (low) to 60.4 °F (high). Annual precipitation averages 48 Inches. Gratz 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 | 19.2 °F | 35.6 °F | 2.81 in. |
| February | 20.5 °F | 38.5 °F | 2.67 in. |
| March | 28.3 °F | 47.4 °F | 3.85 in. |
| April | 39.0 °F | 60.2 °F | 4.09 in. |
| May | 48.7 °F | 70.4 °F | 4.2 in. |
| June | 57.6 °F | 78.5 °F | 4.61 in. |
| July | 61.5 °F | 83.2 °F | 4.68 in. |
| August | 59.9 °F | 81.7 °F | 4.44 in. |
| September | 52.8 °F | 75.0 °F | 5.07 in. |
| October | 41.9 °F | 63.0 °F | 4.44 in. |
| November | 32.5 °F | 51.3 °F | 3.45 in. |
| December | 25.0 °F | 40.2 °F | 3.73 in. |
| Annual | 40.6 °F | 60.4 °F | 48.04 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 6b : -5°F to 0°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |