10 years
between 5-10 years. The next years we will have 5 weekends in July are 2011, 2016, 2022, & 2033.
every 5 years
Once every 11 years.
October 2010 contains 5 weekends.
because of leap years, October has 5 weekends alternating between every 6 years and every 11 years. The next Octobers with 5 weekends will be 2021 and 2027.
5
There are 14 calendar variations (7 days of the week plus leap years). Some years October will have 5 Fridays, 5 Saturdays, and 5 Sundays. October 1999, 2010, 2021, and 2032 all have 5 Fridays, 5 Saturdays, and 5 Sundays. This looks like an 11 year gap, but October 1988 and 2043 do not have 5 weekends.
2010
yes
10 as there are 5 weeks.
2014
Usually 5.