humidex.py

# t is temperature in °C
# d is dew Point Temperature in °C
import math


def get_humidex(t, d):

    kelvin = 273.15
    temperature = t + kelvin
    dewpoint = d + kelvin

    # Calculate vapor pressure in mbar.
    e = 6.11 * math.exp(5417.7530 * ((1 / kelvin) - (1 / dewpoint)))

    # Calculate saturation vapor pressure
    h = 0.5555 * (e - 10.0)

    humidex = temperature + h - kelvin

    return humidex