Have you ever seen the old movie Endless Summer? Most of the spots they filmed were filmed in winter! Surfers have always been meteorologists of a sort. Especially in the old days before the internet. Winter cold fronts are generally what create the swells that people surf. The northern and southern hemisphere winter fronts crossing the globe over the Pacific and Atlantic generate the vast majority of swell. Once and a while a tropical low pressure like a hurricane will whip up a swell. Often the same storm crossing Russia will snow in Northern Japan then send swell to Hawaii then California and maybe even snow in Texas as it moves east - or at least bring rain. Hmmm i didn't check if Texas gets any snow? Haha.

The pro surfing tour is currently in South Africa at Jeffery's Bay. Winter in Africa.

Onshore wind is always bad for surfing conditions. it's not always onshore though. So you surf around the wind.