I couldn’t find any resources online on how the Apple Watch Ultra performs in below zero temperatures for extended periods of time
will it hold up for many hours in negative 10-30c° conditions?
is it bad in the long term for the battery to be so cold?
how could ice salt affect the watch?
From the Apple Support Article linked below, is the following:
Recommended conditions for using and storing Apple Watch Ultra
Your Apple Watch Ultra works best in the following conditions:
Ambient temperature and other conditions can affect some features on Apple Watch Ultra and other Apple Watch models. For example, your battery might not last as long in cold temperatures. The ECG app is accurate only when used in ambient temperatures from 32° to 95° F (0° to 35° C). Heart rate measurements can be less accurate in low ambient temperatures. And in very low ambient temperatures, or in conditions where the temperature changes rapidly, the touch screen on your Apple Watch might not respond as expected.
Keep Apple Watch within acceptable operating temperatures - Apple Support
From the Apple Support Article linked below, is the following:
Recommended conditions for using and storing Apple Watch Ultra
Your Apple Watch Ultra works best in the following conditions:
Ambient temperature and other conditions can affect some features on Apple Watch Ultra and other Apple Watch models. For example, your battery might not last as long in cold temperatures. The ECG app is accurate only when used in ambient temperatures from 32° to 95° F (0° to 35° C). Heart rate measurements can be less accurate in low ambient temperatures. And in very low ambient temperatures, or in conditions where the temperature changes rapidly, the touch screen on your Apple Watch might not respond as expected.
Keep Apple Watch within acceptable operating temperatures - Apple Support
Apple Watch Ultra and it’s battery life in freezing temperatures
