Riverside, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 5 °C (low) to 16.3 °C (high). Annual precipitation averages 1112.8 Millimeters. Riverside 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 | -6.9 °C | 2.5 °C | 78.99 mm |
| February | -6.1 °C | 4.2 °C | 76.96 mm |
| March | -2.3 °C | 8.9 °C | 93.47 mm |
| April | 3.3 °C | 16.9 °C | 101.35 mm |
| May | 8.8 °C | 22.3 °C | 109.73 mm |
| June | 13.4 °C | 26.6 °C | 113.79 mm |
| July | 15.6 °C | 28.7 °C | 110.49 mm |
| August | 14.6 °C | 27.9 °C | 110.49 mm |
| September | 10.8 °C | 24.4 °C | 102.62 mm |
| October | 4.4 °C | 17.8 °C | 86.87 mm |
| November | -0.1 °C | 10.9 °C | 82.04 mm |
| December | -4.1 °C | 5 °C | 91.95 mm |
| Annual | 4.3 °C | 16.3 °C | 1158.75 mm |
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.8 °C | 2.1 °C | 83.06 mm |
| February | -6.1 °C | 3.8 °C | 61.21 mm |
| March | -2 °C | 9 °C | 88.9 mm |
| April | 3.5 °C | 16.6 °C | 100.84 mm |
| May | 9.5 °C | 22.3 °C | 97.28 mm |
| June | 14.7 °C | 26.8 °C | 105.92 mm |
| July | 16.9 °C | 29.3 °C | 104.9 mm |
| August | 16.1 °C | 28.2 °C | 101.85 mm |
| September | 11.9 °C | 24.5 °C | 109.73 mm |
| October | 5.7 °C | 17.6 °C | 99.57 mm |
| November | 0.3 °C | 10.8 °C | 78.23 mm |
| December | -3.7 °C | 4.7 °C | 81.28 mm |
| Annual | 5 °C | 16.3 °C | 1112.77 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |
| 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 : -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 |