Your data has a problem. Any time analysis that is cyclical should be continuous at its “ends”, so the value of any metric in December should be close to the value of the metric in January, specially when you have removed secular trends (YoY growth). If you want to hide behind “but this is due to averaging”, then please check the daily data to see if Dec 31 ~ Jan 1st. Or at the very least explain the large discontinuities one sees in your first two charts.

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