Swimming is a year round sport. For youth club swimming and professionals, it's basically always going.
In high schools, (this could be different depending the state, but i'm not sure) girls high school swim season is in the fall and boys high school season is in the winter.
During the year, it's usually short course swimming, and the summer season is long course. Also in the summer is country club swimming, but that's not really competitive swimming in most cases, just a bunch of rich kids who call themselves swimmers and mess around.
I don't know what Olympics you're thinking of, but swimming is in the summer Olympics
gymnastics figure skating women's tennis synchronized swimming
Winter Sport
The table tennis is a winter sport as well as a summer sport.
Summer! Competitive badminton is played indoors and can be played in all seasons.
summer
winter
its in the summer Olympics but not the winter Olympics
The number one most watched summer Olympics sport is soccer. The second most watched sport is men's and women's swimming.
Wrestling is a Summer Olympics sport.
Curling is played in the winter because that's the COLDEST season andcurling is a winter sport
Equestrian is a summer Olympics sport, not a winter sport. Therefore the Equestrian games will be in the 2016 summer games.