Hello, and welcome to WeeWX!
I'm not quite sure what you're looking for --- the Customization Guide documents the tag syntax, and lists all the aggregation types and periods, and other goodies.
Perhaps it's a difference in expectations. WeeWX doesn't really have a fixed, flat system of tags like wview had. For example, with wview, you accessed the month's high temperature using a single, fixed name: lowMonthlyOutsideTemp. With WeeWX, it's a hierarchical dot syntax: $month.outTemp.min. With WeeWX, the same syntax is used for any aggregation time or type. So, there's no definitive list.
Hope this helps.
-tk