This hasn't happened with me, but I did notice it a few times in gameplay videos on YouTube. I've noticed what might be a bug in Explore Mode when you customise the weather to have snow, like say max it out to 100%. You will spawn into the world and a minute or so later it seems to all clear away, just gone. Curious if this has happened to anyone else, thought it was worth bringing up.
Can confirm on PC, the date and weather settings seem to clear almost immediately, defaulting to the summery weather look.