It looks like Altadena has become a hotbed for personal weather stations. As of today Weather Underground is displaying data from four stations in Altadena. I note that the station IDs skip a number so chances are we will see KCAALTAD4 come online soon, if they can figure out how to get hooked up.
Weather Underground Tips & Tricks:
1. Check out the new feature that allows you to view Personal Weather Stations using Google Maps.
2. Using a tabbed browser, open up each of the four stations in tabs.