Do large numbers of toads really gather before a big rain?
Do cows really know when it's going to rain?
What does the red sky at night mean?
These are just a few of dozens of weather folklore sayings that have been passed down through the ages. Observers long ago only had what they noticed to go on to help them predict what might be to come. Navigators at sea had to be really sharp with weather trends. While some of the sayings are too vague to matter much, a couple have actual science behind them.
Click on the video to see which ones they are.