I tried to impress my mother-in-law with a computer spoken reading from my weather station. Of course she found something that wasn’t perfect.
In US you normally use a dot as a decimal separator and in Europe we very often use a comma.
It doesn’t matter a lot when you read it but when you make synthetic announcements it sounds wired.
It should be nice if the choice of either a dot or a comma could be included in a future firmware.