dewpoint#
- metpy.calc.dewpoint(vapor_pressure)#
Calculate the ambient dewpoint given the vapor pressure.
- Parameters
vapor_pressure (
pint.Quantity
) – Water vapor partial pressure- Returns
pint.Quantity
– Dewpoint temperature
Examples
>>> from metpy.calc import dewpoint >>> from metpy.units import units >>> dewpoint(22 * units.hPa) <Quantity(19.0291018, 'degree_Celsius')>
Notes
This function inverts the [Bolton1980] formula for saturation vapor pressure to instead calculate the temperature. This yields the following formula for dewpoint in degrees Celsius, where \(e\) is the ambient vapor pressure in millibars:
\[T = \frac{243.5 \log(e / 6.112)}{17.67 - \log(e / 6.112)}\]Changed in version 1.0: Renamed
e
parameter tovapor_pressure
Examples using metpy.calc.dewpoint
#
Dewpoint and Mixing Ratio