Title text:
I've had countless nights where the line never left the bottom zone of the graph, but the few moments where it's climbed all the way to the top have made up for them all.
Transcript:
Transcript will show once it’s been added to explainxkcd.com
Source: https://xkcd.com/3196/
Very accurate.
When we had the northern lights here, we pulled over on the way to the dark-sky location, and the aurora filled the sky.
After it died back a bit, we drove on to the dark-sky, where we spent 3 hours sitting in the dark working out if the green bits were going to spike up again.