Is there a way to view a distribution of numbers of votes cast (for questions or for answers) over the 24-hour daily cycle? Or over a full weekly cycle? I didn't find such a query at data.SE.
We can't observe this directly, but we can group posts by the hour of the day in which they were posted and compute the average scores of each group. I wrote a query for this here. From the graph, it shows that the most activity happens near midnight UTC (or whatever $0$ is), with posts averaging a score of $2.45$ and the least happens near 9:00 UTC, with an average post score of $2.18$ - so there's about a $12\%$ difference in the average scores. There is a similar query by someone else here which produces separate results for answers and questions by day of week.