As others here have mentioned, these temperatures are unusually low for January in this region of Spain. They are the kinds of temperatures one would have seen in January during the "Little Ice Age" between the 15th and 19th centuries.[a][b][c]
Let's hope this unusual drop in temperature is just a "one-off" rare climate event, and not a portend of things to come.
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[a] https://en.wikipedia.org/wiki/Little_Ice_Age
[b] https://www.newyorker.com/magazine/2019/04/01/how-the-little...