Orviston, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 38.1 °F (low) to 59.4 °F (high). Annual precipitation averages 43.8 Inches. Orviston is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 17.5 °F | 33.9 °F | 3.09 in. |
| February | 18.3 °F | 37.1 °F | 2.46 in. |
| March | 25.3 °F | 45.9 °F | 3.41 in. |
| April | 35.7 °F | 59.8 °F | 3.73 in. |
| May | 46.3 °F | 70.7 °F | 4.05 in. |
| June | 54.7 °F | 78.3 °F | 4.12 in. |
| July | 58.8 °F | 82.5 °F | 4.19 in. |
| August | 57.3 °F | 80.8 °F | 4.02 in. |
| September | 50.2 °F | 73.9 °F | 4.35 in. |
| October | 39.5 °F | 61.7 °F | 3.85 in. |
| November | 30.3 °F | 49.5 °F | 3.24 in. |
| December | 23.3 °F | 38.3 °F | 3.27 in. |
| Annual | 38.1 °F | 59.4 °F | 43.78 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |