It's hit or miss in December. Can be snowy or can be sunny and fairly mild. Some trails in Zion might be closed if peaks have snow but tbh I think you’ll be ok! Not too many people as well. Have fun! Both national parks are beautiful.
Thanks
No
Snow and cold! Check park websites for closures
Wrong timing. Go in the months of Jun-Oct.
Been there during summer as well as winter. Winter scenery is very good. White snow on red rocks. Definitely worth a visit.
Yes