From TWC's web site:
average high in Monroe, LA in July: 94
average high in Des Moines, IA in July: 86
average relative humidity levels not given, but I'll wager my salary that Monroe has Des Moines (or anywhere in IA) beat, athough at 86 degrees, it's much easier to get a higher relative humiidty level, because the air can't hold nearly as much moisture. So, it is possible for IA to have higher relative humidity levels because the temp is 8 degrees lower on average.
I've mentioned it before, but all of you have "summer humidity level"-itis when it comes to relating the relative humidities of summer weather. A quick climatological lesson: the relative humidity in the dead summer in the worst spots on earth never get close to 90%-100% in the hottest parts of the day. I'll wager again that in Houston or Monroe, the relative humidity in July and August at the hottest parts of the day (usually 3-5 p.m.) RARELY gets above 60%-65%, when it's 90-100 degrees out.
An air temp of 95 degrees with a relative humidity level of 65% is a heat index of about 120 degrees. It hardly ever gets to those levels. Maybe in the Amazon occasionally....
Doug, an air temperature at 102 degrees and a heat index of 125 is a relative humidity level of about 50%.
Look it up.