First Day Of Summer 2024 Canada Time. Summer 2024 starts on thursday, june 20th in the northern hemisphere, with the first day of summer being the longest daylight day of the. The summer solstice is the first day of astronomical summer, although the more logical metrological summer.
Here are key dates to remember for the spring and summer of 2024 in canada: Thursday, june 20 is the official first day of northern astronomical summer for 2024 โ summer solstice โ which is the longest day of the year for this half of the planet.