How many weeks each month for 2009?

Answer 1

Actually, there are 53 in 2009 due to the leap week; For more information, see the following links:

1. http://en.wikipedia.org/wiki/ISO_8601 2. http://www.phys.uu.nl/~vgent/calendar/isocalendar.htm 3. http://www.personal.ecu.edu/mccartyr/isowdcal.html 4. Calendar week number defined (according to ISO 8601:2004, see 2.2.10 (http://isotc.iso.org/livelink/livelink/4021199/ISO_8601_2004_E.zip?func=doc.Fetch&nodeid=4021199)): ordinal number which identifies a calendar week within its calendar year according to the rule that the first calendar week of a year is that one which includes the first Thursday of that year and that the last calendar week of a calendar year is the week immediately preceding the first calendar week of the next calendar year ------------- The answer above is incorrect - 2009 is not a leap year, and even if it was there are not 53 FULL weeks, or anything close to that. All normal years (non-leap years) contain 52 weeks and one day and leap years contain 52 weeks and 2 days. The answer above only answers the LABELLING system of each day in the year, and as such the last 1 day in a normal year and the last 2 days in a leap year are laballed as the 53rd week of the year. Either way, it doesn't answer the question asked. Now... Every 31 day month (namely January, March, May, July, August October and December) contains 4 weeks and 3 days or 4.42857 weeks (to 5 decimal points). Every 30 day month (namely April, June, September and November) contains 4 weeks and 2 days or 4.2857 weeks (to 5 decimal points). And February contains an even 4 weeks exactly for 2009 as in 2009 February has 28 days. Lastly, if you are looking for the AVERAGE number of weeks in every month in 2009 (and any other non-leap year), this would be 4.34524 weeks - to 5 decimal points (or roughly 4 weeks and 2.4 days in every month).