Yes, I knit throughout the summer. I belong to a knit group, so it gives me some encouragement to continue working on projects through the year. I find the summer is a great time to start on holiday gifts or decorations. That way, I'm not rushing to get projects done when the holidays are upon us.
The summer's also a great time to try a new project or technique, since I'm less likely to have a set time to get it finished.
Wishing you a great summer, filled with lots of yarn fun :)