This is a pretty common question, and honestly it doesn’t make a difference either way. It is better for your tree to prune in the dormant season so it isn’t wounded or shocked as much. It is also easier to see the dead wood in the winter months when pruning. But for full removals, any time of the year is good; although, you might want to have the dead trees taken down before the rain and hurricane seasons hits because if you have a dangerous tree, you don’t want to leave it exposed to extreme weather conditions.