Presumably, each record includes a date field.
You can add this calculation field, cMonth, to compute the date for the first day of the same month:
Datefield - day ( datefield ) + 1
You can now sort your records by cMonth to group your records by month in chronological order.
If you do not already have one, add a summary field to this table that computes the "total of" your daily waste field.
Now you can set up a chart where MonthName ( Datefield ) provides the labels for each bar and your summary field provides the Y axis values. Make sure to specify: "Use Data From Current Found Set" and "Show Data points from groups of records when sorted".
Now you can control what data appears in this bar chart by controlling what records are in your found set and how they are sorted.