Dragonfly,
I have made many change with tags to include the access to statistics with tags.
You just have to translate old tags in new tags in you customized stylesheets or template.
Follow the link this see the new format (it's in french but easy to understand):
viewtopic.php?f=2&t=618
It's fast to make that...I have translate all base stylesheets and templates in less than 30 minutes.
You can also add some new tags in your templates as $Stats[Year,TotalRainfall], etc...
Sorry for this change but sometimes things need to be re-written properly.