Humidity plays a big role in perception of heat. I've been in Florida during the summer. It's a miserable experience. I've been in 115-120 F in the desert. The lack of humidity allows your perspiration to dry off faster and regulate your temperature whereas humid air makes it more difficult. I've golfed under 108 F weather at nice desert golf resorts and found it rather comfortable. Especially with cold beer delivery on the course.
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Not quite. That's a US pint. Imperial measurements are larger. An imperial pint is larger. Our pints are around 105-110 ml smaller. In most things it matters quite a bit to use the right measurement.
If it comes to drinking... well, consider the extra fluid across the pond a small reward. It's like getting a free pint after drinking 3-4 pints of beer.
Yes, that’s my reference for the US:1 Cup = 8 Fluid ounces.

How Many Ounces In A Cup? The Definitive Guide (With Converter) - Heall
What is the difference between an ounce and a fluid ounce? Specifically, how many ounces are in a cup? Check out the post to know the answer.

It’s interesting that they would be described as 14oz and not 20oz.Oh. Fun fact. Most mugs and cups, globally, either measure their volume to the very top or a certain ridge or designated point of a design for their volume capacity.
I've got some stoneware mugs I bought ages ago from a certain Scandinavian mass retailer that was quoted the mugs are 14 fl oz. That's if you fill them to the mid of the handle. They're really close to 20 fl oz if you fill them normally. 22 fl oz if you fill to the brim.
I suppose this isn't remotely a fun fact.