Like a Christmas miracle the today´s published roster did not evaporate any of my planned flights for the next week. But as the previous poster said, the only way of coping with this is to look at it on a yearly basis rather than month by month. You do have to save some of that nice Euros you get on a 90-100 hour month to even out the likes of November.
Of course, in our base, getting 5 new F/Os in one go, with a lot of line training on top of that does not help when the flights are cut by 25% during winter.
Expect 600 hours/yr, 650 if you are lucky, and plan your expenses accordingly.