January is the first month of the year in the Julian and Gregorian calendars, and one of seven Gregorian months with the length of 31 days. 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 begins (astrologically) with the sun in the sign of Capricorn and ends in the sign of Aquarius. Astron… (More on January)