We are now in the last month of the year. December, 31 days and Gregorian and Julian Calendars are the twelfth and last months of the year. December had 30 days, until Numa when it had 29 days, until Julius when it became 31 days long. December is the season of winter. Winter is the coldest season of the year in polar and temperate climates (winter does not occur in tropical climates). So the winter season begins on December 1 and ends on February 28 or February 29. At the Winter Solstice (about December 21), the suns rays come straight to the Turn of the Capricorn.
The days in the northern hemisphere extend, and the southern hemisphere starts to shorten. This month is considered to be the beginning of the summer in some countries, in the winter in the northern hemisphere, and in the southern hemisphere. However, in some countries it is accepted in the middle of summer or winter. The longest day in the northern hemisphere, the longest night in the northern hemisphere.