For 2015 the average across the country was 32.5% for wind. [1] Texas appears to be several percentage points above the average, and newer plants often are better than old plants (if they have similar sites).

Here is state data from 2011-2012 [2], with a handy map [3]. It looks like Scurry County might be in a good part of Texas. In principle, the data for 2015 is available here [4], although one would have to process it.

[1] https://www.eia.gov/electricity/monthly/epm_table_grapher.cf...

[2] http://www.windaction.org/posts/37255-u-s-average-annual-cap...

[3] http://s3.amazonaws.com/windaction/attachments/1962/US-WINDm...

[4] http://www.eia.gov/electricity/data/eia923/