Humidity is in what you're used to, I suppose, but Fort Worth is classified as a humid region, as documented by NOAA and Koppen classification maps. It feels extreme to me when I visit in the early summer, but I live in an arid region, so most of the country is more humid, and Fort Worth is certainly less humid than many places in the South. I always fall back on official measurements for reliable indicators when planting and growing.
I'm not trying to argue with you about whether it seems dry to you, but the numbers make a difference to the plants you grow and how you grow them. Fort Worth gets more humid in the hotter parts of the year, and this has both positive (protection against water loss) and negative (clumping pollen, encouragement of certain diseases) effects on plants.
http://www.srh.noaa.gov/fwd/?n...
https://en.wikipedia.org/wiki/... (Piney Woods section)