This one is debatable in terms of what windiest means to you and how you want to interpret stats.
For me, a windy spot would mean a place that gets a lot of days that have 15 knots or more, for 4 hours (or more), especially if the wind was after work , like starting at 4 and ending at 8 pm.

For some others, it might mean the place that hits 35 knots the most days.

If you accept the most days with solid 15 knots idea, I think that a few places in Texas are going to rank high, like Corpus and SPI.

(Unfortunately, I think we live in a place that is sub-average for wind... oh well). We have plenty of other stuff and if it does pick up, we got tons of riding options.
If I didn't have family and a house here, I would have been in Tx ages ago. Everyone is different, but I'd give up 25 plus knots to ride a ton of days in the 15 to 18 knot range.