The third month of the year, in the northern hemisphere usually considered the first month of spring. The name comes from Latin Martius, short for mensis Martius ‘month of Mars’, and at ancient Rome several festivals of Mars took place in March, presumably in preparation for the campaigning season, since Mars was a god of war.
March comes in like a lion, and goes out like a lamb the weather is traditionally stormy at the beginning of March, but calm at the end; proverbial saying, early 17th century.
March hare a brown hare in the breeding season, noted for its leaping, boxing, and chasing in circles, and taken as the type of something mad (see also mad as a March hare).
so many mists in March, so many frosts in May mist or fog in March presages frost in May; proverbial saying, early 17th century.
See also on the first of March, beware the Ides of March at ides, a peck of March dust.