Absolutely. This snapshot is just one product we were asked to develop so that the general population could actually analyze or see the results. The idea of a normal is so you can compare it to weather normals. It's warmer or colder than the normal. This information was meant to be sort of the same as that, but we actually do have to have authoritative data in the long term for it to help support design of dams and other types of engineering and constructions. So yes, we do have the long-term data.
On May 12th, 2015. See this statement in context.