Pruning in the summer can be beneficial to a tree, but we need to follow the 20-25% rule; NEVER prune more than that, it stresses the tree too much.

Also, if pruning an elm in Dutch Elm disease areas like ours, make sure special precautions are taken to prevent spread of the disease from a diseased tree to a healthy tree.
We clean our handsaws and chainsaw chains thoroughly with a special cleaner that removes any trace of the fungus.

Another thing to do in the summer  when it is very easy to see...
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