# relative_humidity_wet_psychrometric¶

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

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

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

Parameters
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

Changed in version 1.0: Changed signature from (dry_bulb_temperature, web_bulb_temperature, pressure, **kwargs)