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In hot summer weather, a rise in relative humidity increases the apparent temperature to humans (and other animals) by hindering the evaporation of perspiration from the skin. For example, according to the heat index, a relative humidity of 75% at air temperature of 80.0 °F (26.7 °C) would feel like 83.6 ± 1.3 °F (28.7 ± 0.7 °C). [13] [14]
When the temperature is 30 °C (86 °F) and the dew point is 15 °C (59 °F), the humidex is 34. If the temperature remains 30 °C (86 °F) and the dew point rises to 25 °C (77 °F), the humidex rises to 42. The humidex is higher than the U.S. heat index at equal temperature and relative humidity. The humidex formula is as follows: [7] [8]
High humidity and low temperatures cause the air to feel chilly. [37] Cold air with high relative humidity "feels" colder than dry air of the same temperature because high humidity in cold weather increases the conduction of heat from the body. [38] There has been controversy over why damp cold air feels colder than dry cold air.
In a recent study published last month by the American Institute of Physics, researchers from the University of Nicosia in Cyprus looked at the roles that temperature, wind and humidity play in ...
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A given value of relative humidity causes larger increases in the heat index at higher temperatures. For example, at approximately 27 °C (81 °F), the heat index will agree with the actual temperature if the relative humidity is 45%, but at 43 °C (109 °F), any relative-humidity reading above 18% will make the heat index higher than 43 °C. [5]
Whatever the outdoor temperature, thermostat placement affects how your heating and cooling system performs. A thermostat placed in the wrong part of the home will give an inaccurate reading, also ...
Temperature may also play a role in Lyme disease incidence. Schauber et al. (2005) found a positive correlation between the mean summer temperature and the rate of Lyme disease in the northeastern United States. [12] Additionally, Subak (2003) suggests that there may also be a relationship between warmer winters and increased Lyme disease. [11]