Spartansburg, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3 °C (low) to 13.9 °C (high). Annual precipitation averages 1241.6 Millimeters. Spartansburg is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.8 °C | -0.1 °C | 97.28 mm |
| February | -8.5 °C | 1.3 °C | 69.85 mm |
| March | -4.5 °C | 6.3 °C | 89.66 mm |
| April | 1.2 °C | 13.8 °C | 105.16 mm |
| May | 7.3 °C | 20.2 °C | 107.19 mm |
| June | 12.2 °C | 24.4 °C | 123.44 mm |
| July | 14.2 °C | 26.5 °C | 122.43 mm |
| August | 13.6 °C | 25.8 °C | 99.82 mm |
| September | 9.9 °C | 22.3 °C | 107.44 mm |
| October | 4.3 °C | 15.6 °C | 114.55 mm |
| November | -0.6 °C | 8.4 °C | 98.3 mm |
| December | -4.8 °C | 2.4 °C | 106.43 mm |
| Annual | 3 °C | 13.9 °C | 1241.55 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 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 |