And every time the aircraft is down for any long maintenance, that is the best spell of weather in the year.
So true! And also applicable for periods, when the pilot himself/herself is down for maintenance. Someone broke my right hand during a friendly soccer game (very unlucky collision), just one day after I flew over that ridge. (All pilot friends started to make jokes about my soccer playing being more dangerous than my flying.) What followed was the nicest and driest September and early October. When I knew the expected date of receiving clearance of my suspended medical, I looked at the weather forecast and it was destroyed again with fronts after fronts, heavy rain, fog etc. This is how I became 100% confident that I get the clearance from the AME. And I did, just as the bad weather moved in again.