Three weather-related proverbs+meanings

1. The loach is upstream and downstream, and the heavy rain is behind: (Before the rainy day comes, the humidity and pressure in the air increase, and the oxygen in the water is insufficient, so the loach swims out of the water for air).

When frogs croak, heavy rain comes: (When many frogs croak, heavy rain comes).

When the stars blink, the rain is not far away.