Cicadas in Western Washington

Yesterday I distinctly heard the sound of several cicada bugs, in some Black Locust trees. I have never heard that sound before in this marine climate. The only way I recognized it is because I heard them in several eastern states where I visited in April of 2018. Now I'm posting this as a time stamp, so I will be able to reference when I heard them, if I ever hear them again. I suspect they may not appear again for several years.