CBK
Some instructors won't teach in IMC conditions as they need to keep a good lookout when teaching the student general handling, etc.
I would imagine that a full IR trip with SID, etc wouldn't be a problem though in IMC.
Send Clowns
It was cloudy here all day yesterday, we must have got your share.
Why is the CPL less dependent ?
Living in the North my current intention is to do the course at one of the schools at LBA, which is notorious for fog.
FFF
Are you doing a JAA CPL in Florida or will you have to convert when you get back ? How long would that take ?