Adding the UV index marks
We add marks to show which days are above a certain UV index threshold.
Adding the UV index marks#
Next, let's mark days that have a high UV index. But what does a "high UV index" mean? We'll need to make that decision ourselves -- let's define a "high UV day" as any day with a UV index over 8.
These kinds of decisions will come from your expertise as a subject matter expert. When setting a threshold like this in your own charts, think about what might be meaningful to the viewer.
Let's keep our code organized and keep our UV index lines within one group.