We are presently in the most recent month of the year. December, 31 days and Gregorian and Julian Calendars are the twelfth and a month ago of the year. December had 30 days, until Numa when it had 29 days, until Julius when it wound up 31 days in length. December is the period of winter. Winter is the coldest period of the year in polar and mild atmospheres. So the winter season starts on December 1 and finishes on February 28 or February 29. At the Winter Solstice, the sun’s beams come directly to the Turn of the Capricorn. See more Calendrier Décembre 2019 PDF.