This is not my data. Also, I went back and checked where they took the data--looks like as far north as 69 degrees and as far south as 77 degrees and many places in between. So not just Europe. Some places had some variation, but close enough.
Maybe sometime I will learn how to post the data but it will not make any difference for when to locate. Also, these are averages over twenty years--any given day there can be variation due to the various factors.
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