Montrose, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.1 °C (low) to 12.7 °C (high). Annual precipitation averages 1211.3 Millimeters. Montrose is located in USDA Plant Hardiness Zone 5b. 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 | -10.4 °C | -1.3 °C | 89.66 mm |
| February | -9.8 °C | 0.1 °C | 70.61 mm |
| March | -5.8 °C | 4.6 °C | 90.42 mm |
| April | 0.6 °C | 12.3 °C | 105.92 mm |
| May | 6.8 °C | 18.8 °C | 101.35 mm |
| June | 11.9 °C | 23.2 °C | 118.87 mm |
| July | 14.3 °C | 25.8 °C | 117.6 mm |
| August | 13.4 °C | 24.8 °C | 114.55 mm |
| September | 9.2 °C | 21.1 °C | 109.98 mm |
| October | 3.3 °C | 14.2 °C | 119.89 mm |
| November | -1.8 °C | 7.3 °C | 84.33 mm |
| December | -6.6 °C | 1.3 °C | 88.14 mm |
| Annual | 2.1 °C | 12.7 °C | 1211.32 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 5b : -26.1°C to -23.3°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 |