With all of these conditions I think it is important to experience them first of all with an instructor so that if you are caught out then you know what to expect and handle it without panicking. Last winter it started snowing heavily from high level which was quite stunning to fly through with no issues - good viz with big flakes. Another time during circuits a far wetter/harder snow came across the airfield and we decided to stay local until it passed.
The lesson was to stay local if the forecast was uncertain - go up to experience the conditions but don't plan for lunch on the IOW as you might not be able to safely get home!