They will defend Celsius being used for everyday weather reporting with their last breath with their ONLY fallback being "well you're just used to fahrenheit durrrrrrr" as if that logic can't be applied to every unit system on earth.

What doesn't make sense about it? You can tell another person it's in the 30s outside, and you have efficiently communicated more information than is possible when using Celsius. You'd have to say it's between 4 and negative 1, which is just lame. And this remains true across every temperature, because of a variety of factors which I explained above.

It doesn't tell you anything that Celsius can't with a 5 degree swing. This the absolute peak of arbitrary, both 5s and 10s are easy scales to work with. Your example of between 4 and negative one is deranged. I'm in houston right, it's 90°f - if I want to comunnicate that to my yankee girlfriend I'd say "babe it's 90° outside, might get up to one hundred" and so far, you're right this is easy to articulate. If I want to communicate that same information to my mum, I'd say "hey it's 30° outside, might get up to 35°". Both cases convey information with the same accuracy, both cases I haven't mentioned humidity, which for actual temperature feel has a way higher influence then 5 degrees, the extra information I'd gain by strictly converting 31-37.8°C is junk data, the farenheit measure is approximated to begin with and because of a humidity swing carries a huge variability in actual "feel" anyway. I tried to explain this above and clearly failed, as your response doesn't touch on this at all and just insists that people who think in metric don't default to easy to work with numbers.

In every climate which you mentioned above, it's easier to communicate how hot or cold it is outside using Fahrenheit. This is because all of the numbers being used are non-negative integers (aka natural numbers). Even the triple digit ones are one-ten or one-twenty.

The only place with negative integers was Pittsburg, so that point doesn't make sense for the rest and even if it was, your argument is insane. Saying negative 5 is no harder than saying 25, plus having negatives where snow and ice come into play makes it obvious when to be careful outside. I mean your argument here just makes no sense, if there is some added complexity to saying "negative" then it is surely comparable to having to remember a random number of 32. Literal kindergardeners understand negative numbers. Neither this or remembering the 32 number add any meaningful complexity and certainly have 0 impact on anyone's actual use of either scale.