Derived Metrics

Dew Point (Magnus)

Let A=17.62, B=243.12 °C: [ \gamma(T, RH) = \ln(RH/100) + \frac{A T}{B + T} ] [ T_d = \frac{B\,\gamma}{A - \gamma} ]

Vapor Pressure Deficit (VPD)

Using Tetens equation for saturation vapor pressure: [ e_s(T) = 0.6108 \exp\left(\frac{17.27 T}{T + 237.3}\right) ] [ e_a = e_s(T) \cdot RH/100 ] [ \mathrm{VPD} = e_s - e_a \quad (\mathrm{kPa}) ]

Heat Index

Rothfusz regression on \(T_\mathrm{F}\) and RH with Steadman approximation outside domain; results are reported in °C.

Wind Chill

[ \mathrm{WCI} = 13.12 + 0.6215 T - 11.37 v^{0.16} + 0.3965 T v^{0.16} ] with \(T\) in °C and \(v\) in km/h.