Once every 28 years.
The last year that February had five Sundays was 2012. This occurred because February 1, 2012, was a Wednesday, making the Sundays fall on the 5th, 12th, 19th, 26th, and then extending into March. For February to have five Sundays, it must have 29 days, which only happens in leap years.
In 2032 there are 5 Sundays in February, May, August and October.
The only way there can be five Sundays in February is if it is a leap year AND February 1 is a Sunday. The last time that happened was 2004, and the next times it will happen are 2032, 2060, 2088, and 2128.
February, May, August and October.
25 times
There are always 4 Sundays in February, except if it is a leap year and the 1st of February is a Sunday. In that case there are 5 Sundays.
Exactly 14% of all Decembers have five of each of Fridays, Saturdays and Sundays.
Every time February 1st falls on a Monday !
About twice each year
In 2001 there were five Sundays in April, July, September and December.
April, July, September and December have five Sundays in 2018.
The odds are exactly 14.5%, which makes the average frequency once per 6.9 years.