Fig. 35
Dew is a pretty good sign of fine weather. When you can see and hear with remarkable clearness, and everything is calm and still, it is a pretty infallible sign that cold weather is due.
Frost may be looked for on clear, calm, cloudless nights, when the ground is apt to be cooler than the air.
INDICATIONS FROM CIRRUS CLOUDS
When these clouds suddenly appear in the sky on a clear summer day, they indicate wet weather. Especially if the weather ends turn upward, which means that the clouds are coming down. When moisture in the form of little drops cling to vegetation, it is a pretty good indication that there is apt to be more rain.
When the sky assumes the appearance of a gray mass and the sun is observed shining through, it is a pretty good indication that it will rain before night.
When overhead clouds are thick and grayish and the lower surface of them is lumpy, this is an indication of rain.
Whirlwinds of dust are also indications of rain.
THE MOON
The rings that we see formed about the moon are caused by the delicate white clouds through which the moon is shining.