Looks like a Custom Graph to me.
WC Prefs->Tools->New...
Graph Name: Anything you want!
Series 1: Ext. Temp
Style: Filled
Data, Type: Anchored Min/Max/Avgerage (Bars)
Period: Week
Other details: Try as many as you want!!
![Rock On [rockon]](https://athena.trixology.com/Smileys/default/rockon.gif)
The WC capability of Custom Graphs and Gauges is the most under-used function of the app! Play around with these tools and be amazed!!

Be advised that these graphics do tame a lot of cpu work. You are limited to 15 (I think) of each type of graphic. I suggest uploading them conservatively.