In reply to tjn26:
Where are you coming from? If you are limited to weekends just keep watching all the normal channels and if it looks good on Thursday or Friday morning go that evening. Sleep in your car or go to one of the campsites that you just turn up and pitch on.
Crib Goch has been reasonably snowy - definitely enough to be in 'winter condition' - plenty of days already this winter. I did Crib Lem in good winter conditions, probably a little bit lower than CG, on November 10th. I knew it would be worth the drive over on the Sunday after having seen pictures of Crib Goch on a Facebook group on Saturday evening. We are really spoilt for information these days in popular areas of both Snowdonia, the Lakes and the Highlands: reports in FB groups, National Park/Felltop assessors reports, SAIS reporting in Scotland, guides's and instructors's blogs, individual mountain top forecasts from the Met Office, MWIS forecasts.
If you are coming from the SE of England the Lakes and North Wales are probably about the same amount of driving, so consider the Lakes as an alternative. Crib Coch is a better route, but along Striding Edge and down Swiral Edge is a good day out too, and being a bit further north can be more wintery than N Wales.
Lots of relevant tips in https://www.ukclimbing.com/articles/features/chasing_the_very_bloody_epheme...