Wiktionary
a. (context British idiomatic informal English) very cold
Wikipedia
Brass Monkeys is an Australian sitcom that screened in 1984 on the Seven Network. The series was produced by Gary Reilly and Tony Sattler, who are known for comedy series Kingswood Country and Hey Dad!. The title comes from the colloquial expression "cold enough to freeze the balls off a brass monkey", in reference to the cold climate of the Antarctic.
Brass Monkeys is the story of a pretty female doctor who joins a group of men confined to the lonely isolation of an Australian Antarctic expedition station.
Usage examples of "brass monkeys".
Leonard said grudgingly, unhappy with the idea of a slam dunk turning into a whodumit-especially this case, with Wyatt and the rest of the brass monkeys looking on.
It was also cold enough to perform a traditional form of surgery on brass monkeys.
At one point it widens into a swimming hole, if your ancestors don't include any brass monkeys.
The owner-or clerk, whichever he was-was from India, and the fun thing was that in addition to the usual Statues of Liberty, and tee shirts and I Love New York buttons, he had an array of brass monkeys and elephants and Taj Mahals and Hindu gods-that sort of thing.
It was difficult enough to stand still in temperatures suited only to castrato brass monkeys.
The night was windy enough to swallow small sounds, dark enough to lose contact at five paces, and cold enough to do structural damage to brass monkeys.