I have always heard that, and it seems to be pretty accurate. Any west or southwest wind and we always seem to do better.
ANother ole saying here is watch the cows. If the cows are standing, go fish, if they are laying down, stay home. Over the last few weeks I have payed attention to the cows. Seems there might be a bit of accuracy with that saying.
One other one. Notice the sticks in the water. If they are standing up in the water, its not a good fishing day. If the are laying flat (on the water) then its a good day fishing. An old fisherman here told us that, so far, seems theres some truth to that one also. I reckon it has something to do with the pressure.