Parishville, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 0.9 °C (low) to 12.3 °C (high). Annual precipitation averages 1134.4 Millimeters. Parishville is located in USDA Plant Hardiness Zone 4b. 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 | -13.9 °C | -3.1 °C | 80.01 mm |
| February | -13.3 °C | -1.7 °C | 61.21 mm |
| March | -7.9 °C | 3.2 °C | 71.88 mm |
| April | -0.3 °C | 11.6 °C | 90.93 mm |
| May | 6.5 °C | 19.9 °C | 90.17 mm |
| June | 11.9 °C | 23.8 °C | 119.89 mm |
| July | 14.4 °C | 26.2 °C | 116.08 mm |
| August | 13.6 °C | 25.3 °C | 97.28 mm |
| September | 8.9 °C | 21.4 °C | 103.89 mm |
| October | 2.9 °C | 14.2 °C | 123.44 mm |
| November | -2.6 °C | 6.7 °C | 93.98 mm |
| December | -9.2 °C | 0.1 °C | 85.6 mm |
| Annual | 0.9 °C | 12.3 °C | 1134.36 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 4b : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |