Clearly Stone, you don't read a lot of magazines in the decorating or home improvement genre. My wife does though, including several that she subscribes to.
The distribution system for magazines is very strange. Some magazines come to her or are purchased by her near the end of or after the month shown on their cover. Others arrive before that month.
Of six magazines at the top of her pile of relatively recent arrivals one has a cover date of February, 2013, another has a cover date of January/February 2013 and four have a cover date of January, 2013.
As I read once, this is driven by over the counter magazine sales. So they don't end up with a magazine that is past the cover date. Apparently people don't want "old news" even in magazines that are not news oriented.
"Far more critical than what we know or do not know is what we do not want to know." - Eric Hoffer