don't do it!
Suggesting the colony should be killed due to one problem bee is like carpet bombing a town because one of the residents has an ASBO.
IMHO, the only reason to kill bees is disease.
If the queen is the problem, it is not too late to raise your own (despite the weather!).
Alternatively, give them a new queen (prefered BECAUSE of the weather!). Personally, I would use the NUC creation method, and unite.
'If' the issue is genetics, the bees themselves may be grouchy. If this is the case, they will be replaced as the old bees die, and the new bees are born.
Alternatively, defensive bees are great donors for NUC creation.
If you want help dealing with them, PM me. You can't be a million miles away.