humidity.to.dewpoint: Calculate dew point temperature.
In geanders/weathermetrics: Functions to Convert Between Weather Metrics

Description Usage Arguments Details Value Note Author(s) References See Also Examples

humidity.to.dewpoint creates a numeric vector of dew point temperature from numeric vectors of air temperature and relative humidity.

1	humidity.to.dewpoint(rh = NA, t = NA, temperature.metric = "fahrenheit")

`rh`	Numeric vector of relative humidity (in %).
`t`	Numeric vector of air temperatures.
`temperature.metric`	Character string indicating the temperature metric of air temperature. Possible values are `fahrenheit` or `celsius`.

Dew point temperature will be calculated in the same metric as the temperature vector (as specified by the temperature.metric option). If you'd like dew point temperature in a different metric, use the function celsius.to.fahrenheit or fahrenheit.to.celsius on the output from this function.

A numeric vector of dew point temperature, in the same metric as the temperature vector (as specified by the temperature.metric option).

Equations are from the source code for the US National Weather Service's online heat index calculator.

Brooke Anderson brooke.anderson@colostate.edu, Roger Peng rdpeng@gmail.com

National Weather Service Hydrometeorological Prediction Center Web Team. Heat Index Calculator. 30 Jan 2015. http://www.wpc.ncep.noaa.gov/html/heatindex.shtml. Accessed 18 Dec 2015.

dewpoint.to.humidity, fahrenheit.to.celsius, celsius.to.fahrenheit

# Calculate dew point temperature from relative humidity and
# air temperature.

data(newhaven)
newhaven$DP <- humidity.to.dewpoint(t = newhaven$TemperatureF,
                                    rh = newhaven$Relative.Humidity,
                                    temperature.metric = 'fahrenheit')
newhaven