What fraction of a month is 1 day?

Answer 1

A month, is unfortunately, not a standard measure.

Is it 30 days, 365/12 days, 365.25/12 days (to allow a leap year every 4 years) or should you use a more precise measure for a year?

So, the approx answer, using 1 month = 365.25/12 days is

1 / (365.25/12) = 12/365.25 = 0.03285