Nicholson, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.6 °C (low) to 15.1 °C (high). Annual precipitation averages 1110.5 Millimeters. Nicholson is located in USDA Plant Hardiness Zone 6a. 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 | -8.4 °C | 0.9 °C | 76.96 mm |
| February | -8.1 °C | 2.2 °C | 59.94 mm |
| March | -3.8 °C | 7.2 °C | 82.3 mm |
| April | 1.8 °C | 14.7 °C | 93.73 mm |
| May | 8.1 °C | 21.2 °C | 97.54 mm |
| June | 13.1 °C | 25.7 °C | 110.49 mm |
| July | 15.6 °C | 28.2 °C | 115.82 mm |
| August | 14.8 °C | 27.2 °C | 104.14 mm |
| September | 10.8 °C | 23.3 °C | 105.92 mm |
| October | 4.6 °C | 16.6 °C | 104.65 mm |
| November | -0.4 °C | 9.6 °C | 76.45 mm |
| December | -4.7 °C | 3.8 °C | 82.55 mm |
| Annual | 3.6 °C | 15.1 °C | 1110.49 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |