DST does not affect total daylight hours, of course, but rather simply shifts sunrise and sunset times relative to our clocks. People suddenly find themselves having to wake up in darkness, or watch in horror as the sun sets in mid-afternoon. But how many bad days like that are there? How would it change if DST didn’t exist, or if it were always in place?
The maps below show how many good days the US would have under a few scenarios. Assuming “reasonable” sunrise and sunset times have twilight around when the average American wakes up (or earlier) a