Union Deposit, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.3 °C (low) to 17 °C (high). Annual precipitation averages 1154.4 Millimeters. Union Deposit 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 | -5.6 °C | 3.2 °C | 80.52 mm |
| February | -4.9 °C | 4.7 °C | 64.77 mm |
| March | -0.6 °C | 9.7 °C | 95.5 mm |
| April | 5.1 °C | 16.8 °C | 91.95 mm |
| May | 10.8 °C | 22.4 °C | 101.35 mm |
| June | 15.9 °C | 27.3 °C | 108.97 mm |
| July | 18.3 °C | 29.9 °C | 114.3 mm |
| August | 17.4 °C | 28.8 °C | 101.09 mm |
| September | 13.4 °C | 25 °C | 120.14 mm |
| October | 6.9 °C | 18.2 °C | 104.9 mm |
| November | 1.5 °C | 11.8 °C | 82.04 mm |
| December | -2.7 °C | 5.8 °C | 88.9 mm |
| Annual | 6.3 °C | 17 °C | 1154.43 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 7a : -17.8°C to -15°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |