I believe Washington State is colder.When considering the overall mean temperature you must take into account the fact that Washington State has much higher mountains which maintain colder temperatures.And,personally,I ve never heard of anywhere in N.Y. where the temp can stay below minus 20 F* for 2-3 weeks as happens many winters where I live in North Central Washington (State).
Google the average temperatures in both places and find out.
I think Washington state is more colder.