String variables in graphs

Hi there.

I’m using nodered+influxDB+grafana combination.

Recently, i’m taking data from openweathermap.
I use a variable that can assume a degrees values (from 0 to 360). I would like to associate a range of values to a name, for example: from 0 to 75° name “A”, from 76 to 120° name “B” and so on.

Question is: Is it possible to graph a string variable in grafana, where Axis seems to be not editable from the users?