Westlake, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 43.6 °F (low) to 59.5 °F (high). Annual precipitation averages 41.3 Inches. Westlake is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 21.4 °F | 34.9 °F | 2.95 in. |
| February | 22.4 °F | 37.0 °F | 2.27 in. |
| March | 29.0 °F | 45.1 °F | 3.2 in. |
| April | 40.3 °F | 58.6 °F | 3.89 in. |
| May | 51.5 °F | 69.5 °F | 3.83 in. |
| June | 61.2 °F | 78.5 °F | 3.93 in. |
| July | 65.5 °F | 82.0 °F | 3.72 in. |
| August | 64.3 °F | 80.8 °F | 3.76 in. |
| September | 57.6 °F | 74.7 °F | 3.89 in. |
| October | 46.5 °F | 63.0 °F | 3.63 in. |
| November | 36.4 °F | 50.6 °F | 3.17 in. |
| December | 27.3 °F | 39.8 °F | 3.02 in. |
| Annual | 43.6 °F | 59.5 °F | 41.26 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |