Tomorrow is the 21st, which means Earth's north pole will be tipped to the max (23.5o) toward the Sun. It marks the beginning of summer in the northern hemisphere, and winter in the southern hemisphere.
We 'phoned our friends (Skype) in England a couple of weeks ago and told them it was a chilly, but sunny, winter's day in Brisbane with a day time temp of 23 deg C.
They told us not to be so silly; that would be a hot summer's day in the UK with people at the beach paddling in the sea. Trousers rolled up with a knotted hanky on their heads.