Think 115°F is uncomfortably hot? Imagine it being incredibly humid as well. 

2013 continued a trend of water vapor in the surface atmosphere increasing over land and ocean relative to the 1970s, while the atmosphere over land becomes less saturated. 

Earth's atmosphere includes billions and billions of gallons of evaporated water: i

In 2011, Earth’s atmosphere was cooler and drier than it had been the previous year, but it was more humid than the long-term average.