When it rains, it will increase the relative humidity because of the evaporation. The air where the rain is falling may not be completely saturated with water vapor. However, the longer it rains, the more the humidity will increase because of the air constantly drawing the water.

There are two primary measures of atmospheric moisture: relative humidity and dewpoint. Since cold air holds substantially less moisture than warm air, it is easier to saturate a parcel of cold air. Consequently, relative humidity is actually higher in winter than in summer (76% vs. 66%, according to climatology).

The reason is temperature. Warmer temperatures can hold more moisture than colder temperatures. it is temperature that makes all the difference; cold winter air, even when saturated, contains far less moisture than warm summer air. Relative humidity, a common measure of atmospheric moisture, is temperature-dependent.

During winter, indoor air often becomes dry. Cold air, which carries less moisture than warm air, enters the house and is heated, lowering its relative humidity.

Because warm air can hold more moisture than cool air, it feels more humid and the dewpoint temperatures are frequently higher along the eastern seaboard than they are along the west coast in the summer months.

Humidity levels are higher during the night because cold air cannot hold as much moisture as warm air. Cooler air has a lower saturation point, and when the air can no longer hold any more moisture, it gathers on the ground in the form of dew.

Circulating air from a fan can dry out your mouth, nose, and throat. This could lead to an overproduction of mucus, which may cause headaches, a stuffy nose, sore throat, or even snoring.

High humidity can have a number of adverse effects on the human body. It can contribute to feelings of low energy and lethargy. In addition, high humidity can cause hyperthermia — over-heating as a result of your body’s inability to effectively let out heat.

They recommend the following indoor humidity levels: If outside temperature is 10 to 20 degrees, humidity indoors should not be more than 35 percent. If outside temperature is 20-below to 10-below, humidity indoors should not be more than 20 percent.

How To Deal With Humidity

1. Keep Your Windows Open. It may seem counterintuitive to open your windows on a hot day, but you actually want to let the air circulate through your home to avoid increasing humidity levels.
2. Brush Up on Your Gardening Skills.
3. Flooring Options.
4. Don’t Dry Your Laundry.
5. Invest in a Dehumidifier.

While many complain that the moisture covering your entire body—even in air-conditioned spaces—is disgusting, they are wrong. It’s actually good. The skin-feel of a humid day envelops you with its lush embrace and creates a pleasantly soft, dreamy moisture on your limbs.

Lethal levels of heat and humidity are gripping global ‘hot spots’ sooner than expected. But it’s not just the heat that kills. Humidity is deadly when it prevents the evaporation of sweat—a remarkably efficient way for the human body to cool itself.