Moon changing in morning indicates warm weather ; in the evening, cold weather.
If you accidentally drop salt on the ground, it will rain.
When ducks quack profusely, they are said to be "calling for rain."
Of pimpernel, whose brilliant flower
Closes against the approaching shower,
Warning the swain to sheltering bower
From humid air secure. -C.L. Prince
The gentian (Gentiana pneumonanthe) closes up both flowers and leaves before rain.
When the mulberry has shown green leaf, there will be no more frost. [Gloucestershire]
Harvest follows in thirteen weeks after the milk-white thorn scents the air [Scotland].
Easter in snow, Christmas in mud, Christmas in snow, Easter in mud.
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