In CA we swim year round!

Actually, maybe Dec, Jan and part of Feb are a tad too cold...

Well, maybe just too cold in Northern CA. Swimming in Nov. is hit or miss. Sometimes it is warm (80s) and other times it is in the mid 60s or rainy

I'd pack a swim suit just in case (how much room do they take up in a suitcase anyway?)
Nothing here is ever as cold NJ gets though!