Summer 2024 Calendar. Simply scroll through all the design options below, click on the image of the calendar(s) you’d like to use, and print! June 21 doesn't always mark the first day of astronomical summer.

This is the longest day of the year and marks the start of. The first day of summer is also known as the summer solstice, and in 2024 it happens on thursday, june 20 at 4:51 p.m.