I've been hunting for a long time for free Wind Speed information and finally found a good source.
It's ave daily but still could show trends.
http://www.wunderground.com/history/
Type in city or closest airport ->submit
Click custom, set dates...Get History
Goto bottom of page, ..get comma delimited file
Select All/Copy/Paste into Excel
Choose Text to Columns
Viola!
Run Closers vs Early Speed for dependent variable (Wins) over many years when Daily Wind Speed Ave >15