If anyone is operating under the illusion that we live in an arid climate, this ought to set you straight. This is a photo of one of the variegated box elder trees in our yard. It's hard to find the bark at this time of year for all the moss. These are old trees, planted sometime shortly after the house was built in 1906.
Right now we're going through a wet spell, which is pretty normal for this time of year. In the summer, if things are normal, it will be dry.