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January is thefirstmonth of theyear in theJulian andGregorian calendars, and one of seven Gregorian months with the length of 31days. It is, on average, the coolest month of the year within most of the Northern Hemisphere and the warmest month of the year within most of the Southern Hemisphere, characterizing the onset of the Winter and Summer in both hemispheres respectively.
January is named forJanus (Ianuarius), the god of the doorway; the name has its beginnings inRoman mythology, coming from theLatin word for door (ianua) - January is the door to the year.
