Calculate apparent temperature

Calculate apparent temperature \(AT\) (°C) from air temperature \(T\) (°C) and dewpoint temperature \(T_d\) (°C).

Usage

cal_apparent_temperature(t, td, t_unit)

Arguments

t, td

Numeric. Air temperature and dewpoint temperature in degree Celsius (°C), degree Fahrenheit (°F), or Kelvin (K).

t_unit

Character string. Unit of the temperature values. Must be one of "celsius", "fahrenheit", or "kelvin".

Value

Numeric value of apparent temperature in degree Celsius (°C).

Details

Apparent temperature \(AT\) (°C) is an index used to assess human comfort in the warm season. It is calculated using the formula:

$$AT = -2.653 + 0.994 \cdot T + 0.0153 \cdot T_d^2$$

where \(T\) is the air temperature and \(T_d\) is the dewpoint temperature, in degrees Celsius (°C).

The temperature input is converted to degree Celsius (°C) based on the provided t_unit before calculation.

References

Davis, Robert E., Glenn R. McGregor, and Kyle B. Enfield. “Humidity: A Review and Primer on Atmospheric Moisture and Human Health.” Environmental Research 144 (January 2016): 106–16. https://doi.org/10.1016/j.envres.2015.10.014.

Kalkstein, Laurence S., and Kathleen M. Valimont. “An Evaluation of Summer Discomfort in the United State Using a Relative Climatological Index.” Bulletin of the American Meteorological Society 67, no. 7 (July 1986): 842–48. https://doi.org/10.1175/1520-0477(1986)067<0842:AEOSDI>2.0.CO;2.

See also

cal_dewpoint_temperature()

Examples

cal_apparent_temperature(t = 28, td = 12, t_unit = "celsius")
#> [1] 27.3822
cal_apparent_temperature(t = 82.4, td = 53.6, t_unit = "fahrenheit")
#> [1] 27.3822