You can use this simple tool for build SVG graph with temperature from your Miranda Weather Plugin's log (examples: Brisbane/AU autoscale, Brisbane/AU, Moscow/RU).
Unfortunately, I don't like the idea to keep logs or SVGs on the server so you have to copy the source of resulting page and paste it where you like (or Save As the resulting page).
It would be nice if you preserve the copyright and the link to this page in svg file. Thanks.
Feedback and bug reports please post into my blog.