So after doing some testing, a friend of mine and I found out that Synthesis heals the exact same as Morning Sun. We found this odd because Morning Sun does everything Synthesis does & Heals Teammates.
Both Heal the exact same in any weather condition
E.G Both heal 40 in hail & sandstorm, 60 in rain, 80 normally, & 120 in Sunny.
However. We feel as though Synthesis should heal more, seeing as Morning Sun Heals teammates, & Synthesis does not.