Wow, that's the most I've ever seen anyone upvoted for completely inaccurate and misrepresented information. First, that's a real time view of each of the two regions. You don't think that the values may have been different during the day for Europe and the night for the US? More than that, you can't establish a viable trend from a single data point.
Even if you did have the average high summer humidity index for Europe and the US (personally, after having lived in the swamp that is Maryland & Virginia, I'd take a look at them), you still need to overlay the temperature index. 100 relative humidity in Oslo doesn't mean a whole lot when it's a balmy 21C, right?