Answer:
If they sailed the Arabian Gulf:
The average heat index often exceeds 150 degrees in the gulf, making it so a sailor would be drenched with sweat after a one-minute walk across the hangar bay or while merely standing watch in certain parts of the ship.
"Hot wasn't the word for it. There's some other word we need to come up with." Lenox said. "I've been joking that there's cool, warm, hot and then whatever the next word is, that's what it was like there."
The Arabian gulf was very muggy, and high humidity contributed to such high heat.