Hamburg, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5 °C (low) to 16.8 °C (high). Annual precipitation averages 1266.2 Millimeters. Hamburg is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.6 °C | 3.1 °C | 92.2 mm |
| February | -5.9 °C | 4.6 °C | 69.09 mm |
| March | -1.8 °C | 9.3 °C | 97.54 mm |
| April | 3.8 °C | 16.7 °C | 99.57 mm |
| May | 9.3 °C | 22.3 °C | 100.58 mm |
| June | 14.4 °C | 27.1 °C | 129.79 mm |
| July | 17.1 °C | 29.6 °C | 130.05 mm |
| August | 16 °C | 28.7 °C | 116.84 mm |
| September | 11.9 °C | 24.8 °C | 131.32 mm |
| October | 5.4 °C | 18.3 °C | 112.01 mm |
| November | 0.3 °C | 11.6 °C | 87.63 mm |
| December | -3.7 °C | 5.8 °C | 99.57 mm |
| Annual | 5 °C | 16.8 °C | 1266.19 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |