How to interpret graph?

[KathyNS]

What does the bottom edge of the temperature graph represent? And what is the coloured bar under the temperature numbers?

It would be nice to have an accessible key to interpreting this graph.

[idefix37]

@kathyns
This graph is apparently that of a weather station.
Here is a short description:

It is quite similar to Meteogram, but simplified:
https://community.windy.com/topic/14827/how-to-read-meteogram

[KathyNS]

@idefix37 Thanks.