Wind chill and heat index locations are defined is a slightly different way in config.txt. They are found above the rest of the data locations and look like this:
// this section does the heat index and wind chill
// it figures out what to show, wind chill, heatindex or nothing
// depending upon your settings
switch (TRUE){
// if windchill is <= $wind_chill_threshold we'll output it
case ($windchill <= $wind_chill_threshold):
$feelslike = "Wind Chill: $windchill$degree_units";
imagecenteredtext(75, 65, "$feelslike", 2, 7, $color3, 0);
break;
// if heat index >= $heat_index_threshold we'll output it
case ($heatindex >= $heat_index_threshold):
$feelslike = "Heat Idx: $heatindex$degree_units";
imagecenteredtext(75, 65, "$feelslike", 2, 7, $color1, 0);
break;
} // end switch