later as you move towards the south coast where frost is extremely rare and palm trees even grow [not kidding!])
Same in parts of Cornwall (southwest extremity of England). Falmouth is quite well-known for the palm-trees which seem to flourish there. It's a result of the same Gulf Stream which keeps southwest Ireland mild, although in either case if you arrive expecting a sub-tropical, Florida-like climate, you're in for a BIG disappointment!