In the bonus chests you get from the Breath of the Wild DLC

So, as was noted by @BlueBarren, both the Wii U and the Switch have the ability to have multiple profiles. Some of us have always just gone along with a singular profile with no need to have any additional profiles...

If you want to have more than one game state saved in Breath of the Wild, we can simply make a profile for each player that would like to maintain their game state and play it as that user / profile!

There's no in game option to change it.

American version

• Temperature is Fahrenheit
• AM/PM Clock 12:00 - 11:59 am/pm

European version

• Temperature is Celsius
• 24 Hour Clock 0:00 to 23:59

some stupid workaround:

Use an account tied to a different region, or change the consoles region.

EDIT :

It seems you have a hardcopy version of the game which mean there is nothing you can do except buying EU version of the game.

Easier Way :

(°F - 32) x 5/9 = °C