^^ I’ve been to Rochester in the winter - San Diego will be quite a change for a nice getaway. That gives it some context. Even if it ends up unusually cold for us here in SD, your Rochester D will likely consider it somewhat balmy in comparison (and laugh at the San Diegans who think it’s cold out).
btw - this’ll show what the weather was in San Diego for the week of Dec 25 last year -
http://www.wunderground.com/history/airport/KSAN/2014/12/25/WeeklyHistory.html?req_city=&req_state=&req_statename=&reqdb.zip=&reqdb.magic=&reqdb.wmo=