Function metfor::virtual_temperature

pub fn virtual_temperature<T, DP, P>(
    temperature: T, 
    dew_point: DP, 
    pressure: P
) -> Option<Kelvin> where
    T: Temperature,
    DP: Temperature,
    P: Pressure,
    Celsius: From<T> + From<DP>,
    HectoPascal: From<P>, 

Virtual temperature.

From the [Glossary of Meteorology].(http://glossary.ametsoc.org/wiki/Virtual_temperature)

Returns the virtual temperature.