| 2023 Hardiness Zone: | Zone 6b: -5°F to 0°F Zone 7a: 0°F to 5°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F |
| 1990 Hardiness Zone: | Zone 6a: -10F to -5F |
| Average First Frost Date: | Oct. 21 - Oct. 31 |
| Average Last Frost Date: | May 1 - May 10 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 83a - Erie Lake Plain |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 44145 - Westlake, OH | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 19 | 21 | 29 | 38 | 48 | 58 | 62 | 61 | 54 | 44 | 35 | 25 | 41 |
| Avg Max Temp (°F) | 33 | 36 | 46 | 58 | 69 | 78 | 82 | 80 | 73 | 62 | 49 | 38 | 59 |
| Avg Precip (In.) | 2.42 | 2.23 | 2.86 | 3.33 | 3.47 | 3.92 | 3.57 | 3.73 | 3.7 | 2.72 | 3.28 | 3.09 | 38.32 |