relative_humidity_wet_psychrometric

metpy.calc.relative_humidity_wet_psychrometric(dry_bulb_temperature, web_bulb_temperature, pressure, **kwargs)[source]

Calculate the relative humidity with wet bulb and dry bulb temperatures.

This uses a psychrometric relationship as outlined in [WMO8-2014], with coefficients from [Fan1987].

Parameters

  • dry_bulb_temperature (pint.Quantity) – Dry bulb temperature

  • web_bulb_temperature (pint.Quantity) – Wet bulb temperature

  • pressure (pint.Quantity) – Total atmospheric pressure

Returns

pint.Quantity – Relative humidity

Notes

\[RH = \frac{e}{e_s}\]

  • \(RH\) is relative humidity as a unitless ratio

  • \(e\) is vapor pressure from the wet psychrometric calculation

  • \(e_s\) is the saturation vapor pressure

See also

psychrometric_vapor_pressure_wet(), saturation_vapor_pressure()