I’m struggling with a jqgrid requirement. I want it to do double headers like this:

Is this possible, have one header with another below it with ie min / max values, so like having average temperature and then below that a header with min and max
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Yes it is possible. Take a look at the examples:
http://www.trirand.com/blog/jqgrid/jqgrid.html
Click on the last demo:
Frozen Cols.Group Header(new) --> Group Header - with colspan styleThen in the code, you will see it is configured like so: