Using the well-known approximation to calculate the dew point temperature from the actual temperature and the relative humidity, it is very easy to write a small script that can do this calculation for us.
I choosed Python to do this job. Feel free to use this script for your own purposes:
import sys import numpy as np # approximation valid for # 0 degC < T < 60 degC # 1% < RH < 100% # 0 degC < Td < 50 degC # constants a = 17.271 b = 237.7 # degC # sys.argv is program name T=float(sys.argv) RH=float(sys.argv) def dewpoint_approximation(T,RH): Td = (b * gamma(T,RH)) / (a - gamma(T,RH)) return Td def gamma(T,RH): g = (a * T / (b + T)) + np.log(RH/100.0) return g Td = dewpoint_approximation(T,RH) print 'T, RH',T,RH print 'Td=',Td
The script expects two input parameters. First the temperature (in °C) and second the relative humidity (in %).