Why do you feel hotter and more uncomfortable on a hot, humid day than on a hot, dry day?

Answer 1

the body cools itself thru evaporation. here in the midwest we gots your humididity. not a whole lotta evaporation happenin at 90% humididity.

In Reno, the humididity is like 12%, so when you sweat, it evaporates and cools your skin.

Answer 2

In the case atmosphere,the usual presumption that there will be a linear increase in the value of temperature with an increase in the heat is not completely true.This is true in the case of dry air but not in the case of moist air.Moist air is a powerful absorber of the reflected sun's radiation from the earth's surface.So, it absorbs the heat without raising the temperature of the air.Hence a moist air of 25 degree celcius will contain more heat than a dry air at the same temperature of 25 degree celcius.So we feel the heat more when the air moist.
Further, the moist air prevents the evaporation of the perspiration from our body thereby affecting the cooling process.The combined effect of the above two factors make us uncomfortable.

Answer 3

maybe its because then your sweat (which is offcourse, part of your body's way of cooling you down) evaporates less easily because theres more moisture in the air . Its also why clothes dry slower on on humid day, less evaporation.

Answer 4

becuz the only thing capable of holding BTU's is mass...
humid air has greater mass than dry air.

more mass means more BTU's (volume/amount of heat not temperature...)

Answer 5

because of the moisture