Fish won't bite on a falling barometer, or vice versa.
Fish won't bite on a rising barometer, or vice versa.
Fish won't bite on a steady barometer, or vice versa.

When the wind is in the north, the fisherman doth go forth;
when the wind is in the east, the fish doth bite the least;
when the wind is in the south, it pushes the bait in the fish's mouth;
when the wind is in the west, the fish do bite the best!