I lived in Oahu for a few years. The island is divided in half by a large mountain range. So despite the East (Windward) having very high rainfall, the area West of the range (Leeward) is very barren.
Should Sacramento, CA be added on the list? Wikipedia lists the city's average annual precipitation at 18.75 in. https://en.wikipedia.org/wiki/Sacramento,_California#Climate
I've been to all except Sacramento, Fresno,and Honolulu. We went to Kauai instead of Oahu. (Which might explain why I missed Honolulu. It rained every afternoon on Kauai and I mistakenly assumed it would be the same on all the islands.)