| gentimes start=03/01/1993 end=06/30/2019 | rename starttime as _time | eval airtemp=random()%20+10 | eval MonthDay=strftime(_time,"%m-%d") | chart avg(airtemp) as average by MonthDay | append [| gentimes start=03/01/2020 end=06/30/2020 | rename starttime as _time | eval airtemp=random()%20+15 | eval MonthDay=strftime(_time,"%m-%d") | table MonthDay airtemp] | stats values(*) as * by MonthDay ... View more

I'm giving this some thought. Would you be able to post a screenshot of your data & graph?   You're looking for the x-axis to be the months, yes?  and then every plot on the graph is an average of the temperature for that day on 1992-2019?      ... View more