Beer has traditionally been a summer drink and even today with complete access to refrigeration beer sales are greatest in the summer. Post Repeal brewers who faced a changed retail landscape tried to start their selling season in March by promoting bock beer. You can read more about that here.
In today’s retail market pumpkin beer and Oktoberfest gives brewers a fall season. Apparently the Christmas holidays do represent an uptick in beer sales. Some popular styles are heavier beers like porters, stouts and brown ale. My favorite brown beer is Smutty Nose Brown Ale. Here is an article that lists 25 holiday beers.