Hi,
Well you have a really nice development board there with the good old Pickit2 programmer.
You realy need to spend some time looking at the schematics and reading the user guides and you will see that most ports are free to be used as you want.
You do not say if you are doing Assember or C or what kind of analogue temp sensor you are wanting to use ? - but in a word, yes you can run anything on to that board.
The most basic analogue sensor would be a 10k trimmer pot on RA0.