When the sun burns more than usual, rain may be expected.
During the night white frost is formed, owing to calm radiation:
A white frost never lasts more than three days; a long frost is a black frost.
Frost suddenly following heavy rain seldom lasts long.
As the day advances after a white frost, the air becomes dull from the influence of the on-coming depression; whence the saying—
When the frost gets into the air it will rain.
During the very fine weather, on the east side of a wedge-shaped area there is often great visibility with a cloudless sky:
The further the sight the nearer the rain.
When the Isle of Wight is seen from Brighton or Worthing, rain may be expected.
When to the people about Arbrouth the Bell-Rock light is particularly brilliant, rain is expected.