Upon arriving in Nazareth, he went to the synagogue as his custom was. The English word custom is defined as the usual way of doing something. It was Jesus usual practice to go to the synagogue on the Sabbath day. Jesus had a habit of going to the synagogue. Summertime is often referred to as the lazy days of summer.
Summer is a time for leisurely activities.
For those of us involved in academics, whether as a student or an instructor, summer is a time to break out of the strict routines of the school year. We do not have to get up quite as early. There is no need for study every night. For others, summer is a time of vacations and leisure activities that can not be done in the fall, winter, or spring. Summer is a time for breaking the customs or habits of the other three seasons of the year.