When you see a dark, dismal sky, look for rain. A sky with a greenish
hue, described as a sickly-looking sky, is an indication of both rain
and wind. A sailor’s sky, which is red in the morning, means either wind
or rain, and it makes no difference if the sky is cloudy or clear, if at
sunset it is rosy, it indicates fine weather. A gray sky in the morning
indicates fine weather. When daylight is first seen above a bank of
clouds, look for a good stiff wind. Wind is indicated if we have a
bright yellow sky in the morning, and rain is indicated if the sky takes
on a pale yellow hue. If the sky turns bright yellow late in the
afternoon, it generally indicates that rain is near at hand. Unusual
colorations, particularly of deep intense color, indicate wind or rain.
The following appearances indicate a change in the weather: When the
atmosphere is clear and crystalline and the stars appear extremely
bright; when the background of the horizon seems to be pinned up against
the foreground; when the clouds form into delicate white film-like mist
way up overhead. (Fig. 33.)