Hi and welcome to the forum @Maddin91 . If you create a group, the creator can change the hours and weather for all the other player in that group. For example, if you set snow, at all of the other player in your gruop the weater will automaticly change on snow. The good thinks to do this is that it recreate the cloud exacly whit same shape to all.
To create a group you have to add friends. Then click on their name and “add in a Group”.
Hope you find the answer of your question here.
Sincerely,
Filippo