This moth isn't rare in our area, but it isn't common either. Based on a Google search and a quick read, this appears to be one of three species of hummingbird moths and is the smallest of the three, coming in at between 1.5" and 2". I like its name: Snowberry Clearwing Hummingbird Moth.
Paul, you'll be impressed! Just for you... this is a hemaris diffinis