Brass monkey weather
The UK and USA in the early 20th century.
Currant bun
Britain.
Dog days of summer
Britain, 14th century, deriving ultimately from ancient Rome.
It never rains but it pours
Britain, 18th century.
On cloud nine
USA, 20th century.
Potatoes (or taters) in the mould
Britain.
Raining cats and dogs
Under the weather
Winter drawers on
Britain, early 20th century. A pun on the expression ‘winter draws on’ (that is, winter is approaching). ‘Drawers’ is a British slang term for knickers.
Entry 1
Brass monkey weather
Meaning Extremely cold weather. The full expression is 'Cold enough to freeze the balls off a brass monkey'.
Usage Worldwide, mostly among people in their 20/40s, as a slang expression.
Example
- The weatherman says minus 10 degrees and strong winds for tomorrow. That's brass monkey weather.
Entry 2
Currant bun
Meaning Cockney rhyming slang for sun.
Usage Mostly Britain.
Example
- It's rained every day for ages. I can't remember the last time I saw the currant bun.
Entry 3
Dog days of summer
Meaning The hottest days of the summer season.
Example
- I'm roasting - I suppose we should expect that on the dog days.
Entry 4
It never rains but it pours
Meaning When troubles come they often come together.
Usage Worldwide, but somewhat old-fashioned.
Example
- The boiler broke down, the weather turned freezing and Jack's got the flu. It never rains but it pours!
Entry 5
On cloud nine
Meaning Blissfully happy.
Usage Worldwide.
Example
- The day after George proposed to her, Mildred won the lottery. She's on cloud nine.
Entry 6
Potatoes (or taters) in the mould
Meaning Cockney rhyming slang for cold.
Usage Mostly Britain.
Example
- Whoa, it's the coldest day of the winter so far - really taters.
Entry 7
Raining cats and dogs
Meaning Raining very heavily.
Usage Worldwide.
Example
- The monsoon will be here soon - then it will rain cats and dogs.
Entry 8
Under the weather
Meaning Feeling ill.
Example
- I've had a sore throat all week, now it's turned to a cold. I'm feeling right under the weather.
Entry 9
Winter drawers on
Meaning British euphemistic joke.
Usage Britain.
Example
- Autumn is over and these summer clothes aren't keeping the cold out - winter drawers on I suppose.