Fine, warm days are called “weather breeders.”
Calm.
A dead calm often precedes a violent gale, and sometimes the calmest and clearest mornings in certain seasons are followed by a blowing, showery day. Calms are forerunners of the hurricanes of the West Indies and other tropical climes.
Camphor Gum.
Camphor gum is said to rise in alcohol before rain.
Clouds.
If clouds drive up high from the south, expect a thaw.
Coals.
Coals covered with thick white ashes indicate snow in winter and rain in summer.
Coals becoming alternately bright and dim indicate approaching storms.