Mostly December except on the 31st of December when it could be Janurary depending on the time
Quite possible. You see, if you lived in Australia (for example) the month of December IS the middle of their Summer. Conversely, when it is summer in the US, it is their winter.
Alice Springs, Australia is cooler in July than in December. July is in Australia's winter, while December is the first month of summer.
In the US, fall officially ends in the month of December (specifically, December 21st), when winter begins.
Because the two countries are on oppsite sides of the planet. In winter, the northern hemisphere is tilted away from the sun - making our climate colder. At the same time, the southern hemisphere is tilted towards the sun - making Australia's climate warmer.
Spring!
in December
December and January
December.
December 21 to March 21
December.
December. It usually falls on either December 20th or 21st
The summer solstice, which is the longest day of the year, usually falls on 21st or 22nd December in Australia, though it is possible for it to be anywhere from 20th to 23rd December.