When the dew is on the grass, Rain will never come to pass.
     When grass is dry at morning light, look for rain before the night.
High pressure (fair weather) usually allows for cooling at night resulting in the formation of dew early in the morning. Low pressure (rainy weather) is associated with rising air which inhibits the development of morning dew.

     The gnats bite and I scratch in vain,
     Because they know it is going to rain.
Flying insects fly closer to the ground before the rain plus the drop in density of the air before the rains irritate the little fellows causing them to swarm more and to bite more diligently.

     Ring around the moon,
     Rain will fall soon.
The ring is produced by moonlight passing through high thin cirrus clouds. Approaching cirrus clouds along with a falling barometer (low pressure), are usually associated with weather fronts, which produce rain. 

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Ring around the Moon

Rain or fair weather