I needed this info so thought y’all might like it too.
“During the summer you want the fan to blow air straight down, so your ceiling fan needs to run in a counter clockwise direction (as you look up at it). The warmer it is, the higher the speed should be. During the winter, your fan should run at a low speed in a clockwise direction.” Read the more detailed answer below to really understand this answer as there are many exceptions to this rule.
thanks to ~ http://www.hansenwholesale.com/ceilingfans/fan-direction-summer-winter.asp