For weather prediction it usually isn’t that accurate anyway, and varies over time and location a lot.

For the thermostat it does matter, but usually you can set these in steps of 0.5°C. Mine reports back in 0.1°C steps.

Either too heavy (these vehicles are below 200kg) or it doesnt work long enough. Or you’re now hot and humid, which is worse than hot and dry

It is!

Sometimes, but they only work for so long. Mostly just bring plenty water and power through. Every stint is about 4 hours of driving, and then drivers change.

I worked on solar racing cars as a student. The main race crosses outback Australia. One of the questions we often got: Does it have A/C?

No, no it doesn’t. A/C uses about as much power as all of the solar cells on the car deliver. We can either move, or power an A/C-unit.

What do you mean by this? It works fine for me so far, though I’m not a heavy user.