| San Mateo, CA | Castro Valley, CA | United States |
Rainfall | 24 | 21 | 38 |
Snowfall | 0 | 0 | 28 |
Precipitation | 77 | 66 | 106 |
Sunny | 265 | 261 | 205 |
Avg. July High | 74 | 76 | 86 |
Avg. Jan. Low | 42 | 42 | 22 |
Comfort Index (higher=better) | 8.5 | 8.6 | 7 |
UV Index | 4.9 | 5.4 | 4.3 |
Elevation | 46 | 161 | 2443 |