import math


def get_frost_point_c(t_air_c, dew_point_c):
    """Compute the frost point in degrees Celsius
    :param t_air_c: current ambient temperature in degrees Celsius
    :type t_air_c: float
    :param dew_point_c: current dew point in degrees Celsius
    :type dew_point_c: float
    :return: the frost point in degrees Celsius
    :rtype: float
    """
    dew_point_k = 273.15 + dew_point_c
    t_air_k = 273.15 + t_air_c
    frost_point_k = dew_point_k - t_air_k + 2671.02 / \
        ((2954.61 / t_air_k) + 2.193665 * math.log(t_air_k) - 13.3448)
    return round(frost_point_k - 273.15, 1)