Garrett, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 2.4 °C (low) to 14.7 °C (high). Annual precipitation averages 1120.1 Millimeters. Garrett is located in USDA Plant Hardiness Zone 6a. 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 | -8.8 °C | 1.2 °C | 84.07 mm |
| February | -8.2 °C | 2.9 °C | 73.91 mm |
| March | -4.4 °C | 7.8 °C | 94.23 mm |
| April | 1.3 °C | 15.1 °C | 97.79 mm |
| May | 6.9 °C | 20.3 °C | 119.89 mm |
| June | 11.6 °C | 24.6 °C | 116.33 mm |
| July | 13.7 °C | 26.7 °C | 101.6 mm |
| August | 12.8 °C | 25.9 °C | 95.25 mm |
| September | 8.8 °C | 22.6 °C | 93.22 mm |
| October | 3.1 °C | 16.1 °C | 82.04 mm |
| November | -2 °C | 9.3 °C | 74.68 mm |
| December | -5.7 °C | 3.6 °C | 87.12 mm |
| Annual | 2.4 °C | 14.7 °C | 1120.13 mm |
| 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 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 | Dfa - Humid Continental Hot Summers With Year Around Precipitation |