31 Click to see full answer Beside this, how many days does December 2019 have? 31 days One may also ask, what months have 31 days? Months that have 31 days are: January, March, May, July, August, October, December. Beside this, how many days are there in the month of December answer? 31 days How many days does each month have? 2020 has 366 days. January (Jan) 2020 There are 31 days in this month. February (Feb) 2020 There are 29 days in this month. March (Mar) 2020 There are 31 days in this month. April (Apr) 2020 There are 30 days in this month.