dew.py

    @staticmethod
    def get_dew_point(t_air_c, rel_humidity):
        """Compute the dew point in degrees Celsius
        :param t_air_c: current ambient temperature in degrees Celsius
        :type t_air_c: float
        :param rel_humidity: relative humidity in %
        :type rel_humidity: float
        :return: the dew point in degrees Celsius
        :rtype: float
        """
        A = 17.27
        B = 237.7
        alpha = ((A * t_air_c) / (B + t_air_c)) + math.log(rel_humidity / 100.0)
        return (B * alpha) / (A - alpha)