"Weren't you cold?"
Translation:Nach robh thu fuar?
Are you sure it wasn't one of these:
An robh thu fuar? Cha robh = Were you cold? No.
A bheil thu fuar? Chan eil = Are you cold? No.
Because those are listed in the sentences, whereas your example isn't... and you can't use 'Chan eil' (I am not) to answer to 'Nach robh ...' (Were you ...) as that should be 'I was not'.
Hope that helps.