don't get me wrong...if everything comes together & the conditions are perfect (ie: little or no wind, sunny, warm air temp, minimal duckdiving), then a 4/3 is feasible in january or february. but how often does that happen? the best winter surf comes when it's windy & cold, by & large, & (at least here in nj) tends to involve a lot of duckdiving...something that gets pretty "exciting" in a sub-40° water in a 4/3. it's even more "exciting" in sub-35° water.
the guy is located in rhode island...those of you suggesting that a 4/3 is practical all winter up there are potentially endangering his life w/ crappy information.