average working days per month
21.67 days per month. There are 52 weeks in the year with 5 working days each = 260 days, and when divided by 12 months = 21.67 days. Weekday holidays are also included. I would say this to be more a accurate calculation: Would it not be correct to say on average there are 365.25 days a year (365 normally 366 every 4th year).