After playing this lot for the last few evenings, I finally got the snow to go away in the Spring. How I got there was to use the aspiration object to set the season to Winter. I played through Winter and still had snow in Spring. But I realized that I never had a snowstorm which was odd. So I reset to Winter again and then used the object to make it snow. After it starting snowing, I used the object to turn the snow off. And afterwards, the game started snowing again. At one point I thought it wasn't going to stop but it finally did. When Spring came, the ground cover transitioned and the snow went away completely leaving a nice green lawn. I still have to play through the seasons to make sure but I think it fixed itself.
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