Climate battle: Europe vs. United States

1) Humid Subtropical is hard to place in Europe, because it's never that humid and is much colder on average, so the tiny amount of locales considered Humid Subtropical in Europe are more Mediterranean, or are micro-climatic in nature. Nothing compared to the vast stretches of hot, mild, and humid Subtropical regions of America.

2) That's not an Arid climate, that's a Semi-Arid climate. Europe has no Arid climates.

3) Not only does the U.S. have Hawaii, an island fairly close to the mainland (compared to the examples people of Europe are throwing out, like islands located across the globe from them,) and even located on the same tectonic plate as the west coast, and is actually a state, and therefore must be included, but it also has substantially large regions of Tropical Rainforest, Tropical Monsoon, and Tropical Savanna climates in Florida, Tropical Savanna climates in far South Texas, and Tropical Rainforest and Tropical Savanna climates in Hawaii. Europe has nothing that can compare.

And honestly, the climate zones that are even considered Semi-Arid in Europe are so small, so cold on average, and so easily interchangeable with Mediterranean that they're hardly worth mentioning