Here's an anec dote. Radar outage at my destination, several of issued holds at the outer marker waiting for other planes to get down and the fog to lift, that goes on for an hour doing laps, several planes watching each other over a cloud deck. Fuel gets to divert bingo so I divert, half way there I hear the tower at the first field say weather is now up to mins, planes now getting in. Asked for and got a return vector, begin the ILS and tower says the winds just shifted to a strong tailwind. Decided to do a circle to land and barely able to see the airport to land going the other way with a minimal fuel reserve. How's that for the daily routine? This isn't every day, but I'd say it's every two weeks or so.