When March weather roars “in like a lion,” the adage suggests that the end of the month will leave like a lamb.
This is because during early March, the constellation Leo is rising in the east, crossing the meridian on March 20.
Therefore, the lion is associated with spring.
At the same time the constellation Aries the ram, or the lamb, is setting in the west.
So every March is “in like a lion and out like a lamb.”