Have you noticed it is dry? Might have some disease management benefits, but the detriment to the tree overwhelms that – especially for newly planted trees. And for larger trees, we don’t always see the effects immediately. I wish I could solve this problem for you – and for me, too.
So if you want to know how dry it is and what the predictions are, here are some resources.
http://www.nrcc.cornell.edu/regional/monthly/monthly.html – click on percent of normal monthly precipitation.
http://newa.cornell.edu/# – you can always wander around in NEWA to find all sorts of environmental information.