mould risk index

#!/usr/bin/env python3
#
# Usage:
#
# mindex.py t h
#
#  t = temperature in °C
#  h = relative humidity in %
#
# Returns a mould growth risk index 0-3 based on
# http://www.penthon.com/vanliga-fragor/faq/vad-innebar-mogelindex/
#
#  0 = No risk
#  1 = Mould growth possible after > 8 weeks
#  2 = Mould growth after 4-8 weeks
#  3 = Mould growth after 0-4 weeks
#
#  Hans Palm 2017-12-21

import sys
import math
temp = float(sys.argv[1])
hum  = float(sys.argv[2])
mtab = [
     [0,0,0,0],     # 0°
     [0,97,98,100], # 1°
     [0,95,97,100], # 2°
     [0,93,95,100], # 3°
     [0,91,93,98],  # 4°
     [0,88,92,97],  # 5°
     [0,87,91,96],  # 6°
     [0,86,91,95],  # 7°
     [0,84,90,95],  # 8°
     [0,83,89,94],  # 9°
     [0,82,88,93],  # 10°
     [0,81,88,93],  # 11°
     [0,81,88,92],  # 12°
     [0,80,87,92],  # 13°
     [0,79,87,92],  # 14°
     [0,79,87,91],  # 15°
     [0,79,86,91],  # 16°
     [0,79,86,91],  # 17°
     [0,79,86,90],  # 18°
     [0,79,85,90],  # 19°
     [0,79,85,90],  # 20°
     [0,79,85,90],  # 21°
     [0,79,85,89],  # 22°
     [0,79,84,89],  # 23°
     [0,79,84,89],  # 24°
     [0,79,84,89],  # 25°
     [0,79,84,89],  # 26°
     [0,79,83,88],  # 27°
     [0,79,83,88],  # 28°
     [0,79,83,88],  # 29°
     [0,79,83,88],  # 30°
     [0,79,83,88],  # 31°
     [0,79,83,88],  # 32°
     [0,79,82,88],  # 33°
     [0,79,82,87],  # 34°
     [0,79,82,87],  # 35°
     [0,79,82,87],  # 36°
     [0,79,82,87],  # 37°
     [0,79,82,87],  # 38°
     [0,79,82,87],  # 39°
     [0,79,82,87],  # 40°
     [0,79,81,87],  # 41°
     [0,79,81,87],  # 42°
     [0,79,81,87],  # 43°
     [0,79,81,87],  # 44°
     [0,79,81,86],  # 45°
     [0,79,81,86],  # 46°
     [0,79,81,86],  # 47°
     [0,79,80,86],  # 48°
     [0,79,80,86],  # 49°
     [0,79,80,86]   # 50°
]

rtemp = round(temp)
rhum = round(hum)
if (rtemp <= 0) or (rtemp > 50):
     mindex = 0
else:
     for i in range(1,4):
          if (rhum < mtab[rtemp][i]):
               mindex = i-1
               break
     else:
          mindex = 3
print (mindex)