Which months have 5 weeks?

There are 35 days in 5 weeks, and no months have more than 31 days. So on that basis, no month can ever have 5 weeks. However, a month can be spread over part of 5 or even 6 different calendar weeks, like if a month of 30 or 31 days began on a Saturday. With the exception of February in a non-leap year, every month will be in a least part of 5 calendar weeks. In different years different months will do that, as when months start changes from year to year.