| | Clayton, CA | Atherton, CA | United States |
| Rainfall | 19.2 | 17.1 | 38.1 |
| Snowfall | 0 | 0 | 27.8 |
| Precipitation Days | 64.3 | 60.6 | 106.2 |
| Sunny | 257 | 261 | 205 |
| Avg. July High | 88.1 | 79.7 | 85.8 |
| Avg. Jan. Low | 39.1 | 40.5 | 21.7 |
| Comfort Index (higher=better) | 8.5 | 8.7 | 7 |
| UV Index | 5.4 | 4.9 | 4.3 |
| Elevation ft. | 394 | 59 | 2443 |