Insects and birds fly lower to the ground than normally they would do in heavy moisture laden air.
If you sight insects and birds flying lower than usual, near the ground, it indicates likelihood of rain.
Most insect activity increases before the advent of a storm.
On the other hand bee activity increases before the advent of fair weather.
In low pressure regions slow moving or difficult to detect winds and heavy humid laden air often indicate a low pressure.
One can smell and hear low pressure. The inactive humid air makes jungle odors much sharper and easy to detect.
Further sounds have more clarity and carry farther in low pressure than high pressure.
This signals advent of bad weather and this bad weather may linger on for several days.
Advisor, Corporate Risks
Assistant Professor, MBA Competitive Intelligence & Corporate Warfare program
I think it’s necessary to add plants here. Some flowers fold their petals before rain.
Maybe you know the names of the flowers. In different regions they are different.