Blue sky in the northwest foretells fair weather and a good breeze. If the moon rises red and appears very large, then rain is only a half day away. In Britain, for instance, loud singing crickets predict the coming of violent storms. If spiders weave their webs before noon, then it will be fair weather. Ants are supposed to be busier before a storm, as are cockroaches.
Locusts sing when the air is hot and dry.
If wasps build their nests high, a severe winter is on its way. Even the weather itself, can be used to predict future conditions. For instance, for every fog in August, there will be a snowfall in winter. Furthermore, a hot summer precedes a cold winter. If the autumn is windy, then expect a mild winter.