how many weeks is a month
In that four year period there are always 12 months meaning that on average there are 30.4375 days per month. A week is seven days by any definition so that means, on average there are 4.348218571 weeks per month. that number is rounded slightly. you could be exact using a fraction. there may be ways to be more precise, but why bother. the number still comes out around 4.