Whether you use weather or not, the general point is that your fictional world must seem realistic to the reader, no matter how fantastical the setting. That may well mean you do need to share some details as to what the climate is etc to help readers get a better understanding of your creation but only put in the details the reader has absolutely got to know and leave it at that. Your reader will want to fill in some gaps for themselves. Also, you don't want them switching off because all that lovely research detail you put in and you found fascinating has done nothing whatsoever for them!
Ask yourself if the reader really needs to know this. I've found the simple approach of "just the facts, Ma'am, just the facts" is a great way of working out what to put into a story. I've also found it best to share those facts in as palatable a form as possible. No great splurge of information but drip feeding it as and where necessary makes it easier to take in and therefore more entertaining and acceptable to your reader. And that is where the reader will keep on reading and hopefully loving your story!