Niles, Ohio has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 4.1 °C (low) to 16.1 °C (high). Annual precipitation averages 1043.4 Millimeters. Niles 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 | -7.4 °C | 1.8 °C | 76.71 mm |
| February | -7.1 °C | 3.4 °C | 57.15 mm |
| March | -2.9 °C | 8.6 °C | 77.98 mm |
| April | 2.7 °C | 16.2 °C | 95 mm |
| May | 8.3 °C | 22.2 °C | 98.04 mm |
| June | 13.3 °C | 26.8 °C | 108.71 mm |
| July | 15.7 °C | 28.9 °C | 113.28 mm |
| August | 14.6 °C | 28.1 °C | 88.39 mm |
| September | 11 °C | 24.6 °C | 98.81 mm |
| October | 4.9 °C | 17.6 °C | 83.06 mm |
| November | 0.2 °C | 10.5 °C | 70.87 mm |
| December | -3.9 °C | 4.4 °C | 75.44 mm |
| Annual | 4.1 °C | 16.1 °C | 1043.44 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 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |