I flew out of SCJ both this last December and the preceding December. I have flown out (and into) to SCJ many times but both these times in December, the weather was cloudy-not particularly stormy or windy-just cloudy. I have noticed whenever the weather is like this, the takeoff is to the south, as opposed to the regular takeoff to the north. I'm sure there is a very simple reason, however because both these times it was not windy or stormy, I cannot seem to think of one. Perhaps the pattern alters frequently and just by chance, its been a northern takeoff when the weather is cloudy. If anyone has any information I would appreciate it.