Brandonville, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.5 °C (low) to 15.1 °C (high). Annual precipitation averages 1264.2 Millimeters. Brandonville 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. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.3 °C | 1.3 °C | 88.65 mm |
| February | -7.7 °C | 2.9 °C | 69.34 mm |
| March | -3.4 °C | 7.5 °C | 91.69 mm |
| April | 2.6 °C | 15 °C | 104.39 mm |
| May | 7.7 °C | 20.9 °C | 112.78 mm |
| June | 12.8 °C | 25.2 °C | 123.44 mm |
| July | 15.2 °C | 27.9 °C | 123.7 mm |
| August | 14.1 °C | 26.9 °C | 108.97 mm |
| September | 10.3 °C | 23.1 °C | 129.79 mm |
| October | 4.3 °C | 16.7 °C | 120.9 mm |
| November | -0.6 °C | 9.8 °C | 92.71 mm |
| December | -4.8 °C | 4.1 °C | 97.79 mm |
| Annual | 3.5 °C | 15.1 °C | 1264.15 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 100-125 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 | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |