I'm going to have another play with it, but the version I tried last year only supported a couple of weather details, and I was also after something that I could put a 'box' over a certainly part of the image, and put the weather details in to that.
The idea is to publically hide a neighbours back verandah area, without using a privacy mask on the camera, as the camera itself provides a source of security for that neighbour if things go bad.
I like the idea of being able to put the weather text in a particular zone .