Father's Day 2015 also marks the official start of summer.
The summer solstice, heralding the beginning of summer in the Northern Hemisphere, arrived at 12:38pm EDT, Sunday.
The timing of the solstice depends on when the sun reaches its northernmost point of the equator.
It's the day with the most hours of sunlight during the whole year.
Environment Canada's seasonal forecast called for a warmer, more traditional, summer after a long winter and cool spring.