A oft-repeated water vapor myth is that warm air can “hold” more water vapor than cool air.
The period from June 30 through July 23, 2013 in Washington, D.C. was the second most humid in recorded history (dating back to 1937).
The assumption that humid air is heavier than dry air is wrong. Learn why...
When a meteorologist or a dedicated weather weenie hears the “90-degree heat with 90 percent humidity” refrain he or she winces and wants to say something like, “It never happens here."
The dryness of Death Valley's heat means it doesn't actually feel as hot there as it does in Washington on our hottest days.