Before revision: The Blaney-Cridle equation is a method for estimating reference crop evapotranspiration : ET0 = p ·(0.46·Tmean + 8) Where: ET0 is the reference evapotranspiration [mm day-1 ] (monthly) Tmean is the mean daily temperature [°C] given as Tmean = (Tmax + Tmin )/ 2 p is the mean daily percentage of annual daytime hours.
After revision: The Blaney-Cridle equation is a method for estimating reference crop evapotranspiration : ETo = p ·(0.46·Tmean + 8) Where: ETo is the reference evapotranspiration [mm day-1 ] (monthly) Tmean is the mean daily temperature [°C] given as Tmean = (Tmax + Tmin )/ 2 p is the mean daily percentage of annual daytime hours.