If a circle forms ‘round the moon, ‘twill rain or snow soon.
The undesirable weather fronts that punctuate March can make for agricultural crises. For generations, people have been watching the moon for signs of what will be. For example, the ring that sometimes circles the moon is caused by high-level clouds that are made of ice crystals. This ring can often be a predictor for upcoming low pressure systems. This means wet weather.
Cold is the night . . .When the stars shine bright.
Stars and other celestial bodies appear brighter in clear skies. Moisture in the air will dim these heavenly bodies because it tends to hold in the day's heat. This, of course, means warmer temperatures. In reverse, the drier the colder the temperatures and the brighter the stars.
“If birds fly low, then rain we shall know.”
Birds fly at lower altitudes when there is a drop in air pressure. The heavier air is more difficult to fly through. A drop in air pressure causes air to become “heavier,” making it harder for birds to fly at higher altitudes. People pay attention to this because could mean bad weather (storms, rain, etc.)