I jump at a Cessna DZ, so I can look at the GPS groundspeed and subtract that from the airspeed, which, if you are flying into the wind, gives you the wind speed. You can also get a pretty good idea of the windspeed by hanging your head out the door and determining how fast or slow your ground speed is. Slower ground speed means take it out farther and take more time between jumps. Not scientific, but it works very well, even for CRW.
I also ask people and pilots on the previous loads what their experience has been. John's advice to look at the clouds is a very good one if you can remember to do it!
(This post was edited by Croc on Jun 10, 2012, 10:53 AM)