I never thought to have my work network monitoring system watch my home weather station, but it is essentially just data to graph and alarms when you think about it. Given that I spent over $400 on an ethernet temperature probe for the server room a few years ago, I probably could have done that for under $100 with a bridge and tower sensor.....
It has proven to be fairly useful. It's nice to have the data, even if it's not "pretty." My real goal is to aggregate disparate data for home energy monitoring. In my old house, the temperature upstairs can vary quite a bit from downstairs. So I'd like to know - given the temperature outside, and how hot it is inside, how long will it take my window AC to get it to the desired temperature?
If I can analyze that type of info over time, I hope to develop trends so I can know exactly the right time to turn on the AC. In the end I doubt it will really save me a ton of money, but it's interesting nonetheless.