The first command I gave it was to turn off those @%$& flashing blue and red LEDs.

Yeah, stunning, isn't it?

It wasn't too annoying for the first 10 minutes or so but after that it was driving me mad! I can imagine the comments I'd get with that thing flashing away all night.
Do you know what the function for the power supply voltage is? It
appears to be an 8 bit a/d reading with a 5V reference scaled by 3/13. If I assume that, I calculate 11.8V based on my reading and according to the data sheet, they are supplying 12V to the weather station. The documentation is pretty bad in places.