How often does December have 5 Sundays Mondays and Tuesdays?

December can have five Sundays, Mondays, and Tuesdays only in specific years. This occurs when December 1st falls on a Sunday, making the Sundays fall on the 1st, 8th, 15th, 22nd, and 29th, while Mondays and Tuesdays also align to allow for five occurrences. This scenario happens approximately once every 28 years in the Gregorian calendar, with the next occurrence in 2030.