Hi Mr T,
I think what you are looking for is the component heartbeat log.
You can log up to 3 components per device in 10,30,60 min & 24 hrs intervals. It's in the components panels labeled
Heartbeat LogIf it's activated ChipChop will automatically log the status for that component on the specified interval. There is a log size restriction but for small values like temperature you could probably have at any point around 2 weeks of data at 10 mins intervals (around 144 entries per day)
Once working you will find a "Log" button appear for in the app in the device details panel
I haven't implemented yet a graph on the phone (I will get there eventually)
If you go view the log in the Dev Console > Live Control then if the values are numeric you will also get a graph that you can zoom in/out and rollover to see the exact values
Here is the link for the post with some more info https://forum.chipchop.io/post/219/
Let me know if you need any help setting it up