Think It Was a Cold Spring? It Was!

I just got my Xcel Energy bill, which stated that this billing period was 11 degrees colder overall than the same period last year. 11 degrees! That is a pretty major difference when we're talking about a whole month. I don't always look closely at this feature, and speak up if you have more information about this, but I don't know if I remember ever seeing a larger year-to-year temperature differential.