It is believed that the commonly accepted folklore phrase, "March comes in like a lion and goes out like a lamb", was first based on the relative positions of the constellations, Leo (the lion) at the beginning of the month and Aries (the ram, or lamb) at the end of the month. Many now associate the phrase to the varied weather conditions during the month of March. If the weather is wild and volatile at the start of March, it is expected to be calm and quiet at the end of the month, and vice versa.
March borrows from April
One more North Country version, said to be the oldest and from Scotland and North England, about the proverb of the borrowing days follows:
Whimsical, entertaining weather folklore quoted as found in the booklet, "Weather Lore, a Collection of Proverbs, Sayings and Rules Concerning the Weather", as compiled and arranged by Richard Inwards, F.R.A.S., London, 1898, and bought by the Harvard College Library with income from the bequest of Henry Lillie Pierce of Boston.