Contrary to all of the above posts and to my own expectations.....I just rode up through Central America, Mexico, Arizona, New Mexico, Utah, Nevada, Idaho and Montana. Temps on the Central American/Mexican coast were hot and humid with rain every day cooling things down. Into the highlands to escape the heat--still afternoon downpours, but cooler all around.
Through the southwestern deserts--hot during the day, but again rain most days cooling things off, and surprisingly humid whether or not it was actually raining. Note that humidity is all relative, and "humid" in Utah is nothing like as brutal as "humid" in Panama. At low elevations temps in the shade ran up into the lower 100's (40C), which was tolerable as long as I was moving. Higher elevations, which includes most areas, were basically fine. Rain was at times blindingly intense, with as much lightning as I've ever seen in my life.
Worst heat was in lower-elevation Nevada and Idaho, which is also where the landscapes are most boring. Still, I saw only upper 90's and lower 100's (35-40C), which is not so had given lower relative humidity.
Hope that helps.
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