It looks like there's a beat frequency. The traffic goes up and down weekly, and probably there's less traffic on the weekends (yay! HN gets out on the weekends

It looks like there's a beat frequency. The traffic goes up and down weekly, and probably there's less traffic on the weekends (yay! HN gets out on the weekends). But it seems like there are 6 months cycles as well. I wonder why, and what an FFT of this time series looks like, or what a sliding window of the FFT looks like.