If March comes in like a lion,then it will go out like a lamb,.

someone help me please........If March comes in like a lion, then it will go out like a lamb..
What does this mean???????

When I've heard this expression there was no "if." Before global warming, it was quite usual for February to be a cold month, so that March would often arrive on a cold, blustery wind, roaring like a lion. But the natural succession of seasons means that things are warming up during March, and the end of March is warmer and quieter, and, lamb-like, smoothly segues into the gentle month of April. That used to be the case in temperate climates, but nowadays, who knows? SS