Moonshine.

I did a post (6/9/12) about "blue moons" which occur when you get two full moons in the same month, and is down to the fact that the lunar cycle is out of sync with the paper calendar.  But of course, it works the other way as well - every now and again you get a month with no full moon.  It can only happen in February (and then only when it's a 28 day one) and comes around about every 20 years.  And yes, this year, 2018, is one such.  There will be no full moon this February.