Orwin, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.7 °C (low) to 16 °C (high). Annual precipitation averages 1304 Millimeters. Orwin 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 | -7.1 °C | 2.2 °C | 91.95 mm |
| February | -6.3 °C | 3.7 °C | 71.63 mm |
| March | -1.9 °C | 8.6 °C | 104.14 mm |
| April | 3.7 °C | 15.9 °C | 107.44 mm |
| May | 9.4 °C | 21.5 °C | 109.73 mm |
| June | 14.2 °C | 26.2 °C | 125.73 mm |
| July | 16.3 °C | 28.9 °C | 125.48 mm |
| August | 15.4 °C | 27.9 °C | 117.09 mm |
| September | 11.4 °C | 24.2 °C | 131.83 mm |
| October | 5.2 °C | 17.7 °C | 118.62 mm |
| November | 0.2 °C | 10.6 °C | 98.55 mm |
| December | -3.9 °C | 4.8 °C | 101.85 mm |
| Annual | 4.7 °C | 16 °C | 1304.04 mm |
| 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 : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |