I may be way off, but from what I received from going through some passages in the Bible Jesus would had to been born maybe sometime in the Fall months. December would have been to late in the Season. I will stay away from Easter, I will let God's Word speak for itself. I grew up Catholic and Christmas and Easter were always a very special part of my life and had a special meaning so it is best that I fade out of this topic.
May the LORD bless you and your family with good bealth and peace in your heart.
Below is a link I came across, do what you will with it. Delete or read, your choice. I, myself just skimmed it.
Spiritualitea: Lady Day, the Vernal Equinox by Mike Nichols