If salt is sticky and gains in weight, it will rain before too late.
When the moon is darkest near the horizon, expect rain.
When the perfume of flowers is unusually perceptible, you can expect rain.
When clouds go up the hill,
They'll send down water to turn a mill. -Hampshire
Frosts will not occur after dogwoods blossom.
According to folklore, heavy thunder will make milk go sour.
Dead branches falling in calm weather indicate rain.
A cat basking in the February sun goes to the stove again in March.