Why is May the Month of Mary?

In Catholic churches and homes around the world, May altars – special places dedicated to Mary, Mother of God – have been erected. Some have pictures of Mary, some have statues of her. Most have bouquets of flowers and many host a crown of flowers for the Queen, symbols of her beauty, purity, and virtue.

It’s a wonderful custom, but do you know why Catholics celebrate May as the Month of Mary?