Rupert, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 5.2 °C (low) to 16.6 °C (high). Annual precipitation averages 1129.3 Millimeters. Rupert 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.6 °C | 2.4 °C | 82.8 mm |
| February | -5.8 °C | 3.9 °C | 61.98 mm |
| March | -1.8 °C | 9.2 °C | 88.14 mm |
| April | 3.7 °C | 16.9 °C | 99.57 mm |
| May | 9.5 °C | 22.7 °C | 98.55 mm |
| June | 14.7 °C | 27.2 °C | 108.97 mm |
| July | 17.1 °C | 29.7 °C | 108.46 mm |
| August | 16.2 °C | 28.6 °C | 102.11 mm |
| September | 12.1 °C | 24.9 °C | 113.54 mm |
| October | 5.8 °C | 17.9 °C | 100.84 mm |
| November | 0.5 °C | 11 °C | 79.5 mm |
| December | -3.6 °C | 4.9 °C | 84.84 mm |
| Annual | 5.2 °C | 16.6 °C | 1129.3 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| 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 | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |