The Army Marksmanship Unit has a posted guideline about wind that I am working with for target shooting at long range. I found it on the CMP website, written by SSG PRASLICK. It derives from a Service rifle pamphlet from 1931. I'll not write it up unless somebody asks, but the site is easily located.
For hunting, determining wind direction, as in picking sites to hunt the next AM or after work, I use two tricks. One is I have an old weather channel radio, that gives wind speed and direction with the Nat Weather Service broadcasts.
The other is I have a series of checkpoints that I look at to and from my hunt spots. Factory smokestacks, flag poles at cemetery and ball field etc.