This is data from Quebec on the number of children born every day. As you can see it's quite messy. There's alot of data in that plot, over 5000 day's figures.
By applying a 30 day rolling average a clear seasonal pattern emerges.
A 365 day rolling average produces a much more clear long term trend than either the daily or 30 day rolling figures.
Data: Number of daily births in Quebec, Jan. 01, 1977 to Dec. 31, 1990 from here.
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