dewpoint.to.humidity: Calculate relative humidity.
In geanders/weathermetrics: Functions to Convert Between Weather Metrics

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

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

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

`dp`	Numeric vector of dew point temperatures.
`t`	Numeric vector of air temperatures.
`temperature.metric`	Character string indicating the temperature metric of air temperature and dew point temperature. Possible values are `fahrenheit` or `celsius`.

Dew point temperature and temperature must be in the same metric (i.e., either both in Celsius or both in Fahrenheit). If necessary, use convert_temperature to convert before using this function.

A numeric vector of relative humidity (in %)

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.

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

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

data(lyon)
lyon$RH <- dewpoint.to.humidity(t = lyon$TemperatureC,
                                dp = lyon$DewpointC,
                                temperature.metric = 'celsius')
lyon