Calculate average value between multiple column in stream

Hi

Let's say I have a stream with this Shape

And I would like this output

Is there any snippets which does this without do any loop?

Rightnow I am using DeriveFields but I don't think it's the proper way because what I have to do is

var expr = '';
expr += '(Temperature_1+Temperature_2+Temperature_3+Temperature_4+Temperature_5+Temperature_6)/6,';
var params = {
    types: 'NUMBER, NUMBER, NUMBER',
    t: stream,
    columns: 'Average,Minimum,Maximum'
    expressions: expr
};
var outputTable = Resources["InfoTableFunctions"].DeriveFields(params);
outputTable.RemoveField(<name of the field I want to remove>);
outputTable.RemoveField(<name of the field I want to remove>);
outputTable.RemoveField(<name of the field I want to remove>);
outputTable.RemoveField(<name of the field I want to remove>);
...
result = outputTable

but this has two problems:

1) DeriveFields I think is unproperly used because it's supposed to be used when the two infotables have the same fields, here they only have one in common then I have to remove all the other extra fields;

2) To calculate max e minimum temperature I use the function Math.max(Temperature_1, ..., Temperature_6) but expression parameter doesn't want expressions with comma inside so this won't work.

Do you have any better suggestion?