Gates Mills, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.3 °C (low) to 15 °C (high). Annual precipitation averages 1159.3 Millimeters. Gates Mills 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. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.8 °C | 1.2 °C | 87.12 mm |
| February | -6.6 °C | 2.4 °C | 62.99 mm |
| March | -2.4 °C | 7.2 °C | 83.57 mm |
| April | 3.7 °C | 14.7 °C | 98.04 mm |
| May | 9.6 °C | 20.8 °C | 102.87 mm |
| June | 14.7 °C | 25.6 °C | 106.43 mm |
| July | 17.1 °C | 27.8 °C | 114.81 mm |
| August | 16.1 °C | 26.9 °C | 101.85 mm |
| September | 12.6 °C | 23.2 °C | 108.71 mm |
| October | 6.8 °C | 16.5 °C | 107.19 mm |
| November | 1.5 °C | 9.8 °C | 94.23 mm |
| December | -3.1 °C | 3.9 °C | 91.44 mm |
| Annual | 5.3 °C | 15 °C | 1159.25 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| 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 | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |