What you probably don't know is that Destiny already HAS a Weather engine! In some of the earliest gameplay footage on Venus, it IS Raining! Oh There will be Weather!! I was at the Mothyards when I was in a light snow fall. Little white specks falling out of the sky. That was before the planned maintenance. That being said, that was the Only time I saw snow, or rain at The Tower in the Beta. I saw puddles at the Tower like it had rained, but never saw any rain... Maybe a slight tweak is in order?