Wind in winter NNE, E, NW with 10-30 knots. Wind in summer SSE, E, SW with 10-25 knots. Lots of thin water creating thermals and heat coming off the island making the wind want to come more East in the arvo.
Be nice to the locals (small island), every one knows every one. No rules, just fun. Andros is know for its reef (second largest in the world). There are some good reef brakes for surfing and kitesurfing when the wind is any other direction than south. Make sure you hire a local with a good running boat to get to the reefs.