I'm 37 and I'm still perplexed that it rains some places in the summer.
How about Maui: '"Big Bog," a spot on the edge of Haleakala National Park overlooking Hana at about 5,400 feet elevation had an estimated mean annual rainfall of 404.4 inches over the 30-year period of 1978 to 2007' (https://en.wikipedia.org/wiki/Maui#Rainfall)