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It's interesting how seasonal this data is. There's a massive spike on weekend traffic.

Is this because there's a lot less overall traffic on the weekend and the IPv6 part is fairly constant, or is there some other reason why IPv6 traffic should spike* during the weekends?

*As a proportion. It jumps about 50 basis points on the weekend.

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I was puzzled about this at first, but my guess is that the weekend spikes are because people are going home and accessing Google's services from residential networks where many ISPs have started to roll out IPv6. Then on Monday people go back to work where there may be less IPv6 access.

I concur with this speculation. My work access is all IPv4 but at home I'm native IPv6 for my whole network.

This definitely. I've also noticed that Netflix streaming from AWS uses my IPv6 tunnel at home, which would explain the huge increase in traffic.

Also, there's a long spike over Christmas/New Year's.

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