Operating temperature

I have just bought a few YeeLights and my intention is to use some of them outside.
I haven’t found anything regarding the operating temperature of the bulbs and I am wondering how much do they resist to cold and heat.

Is there a suggested range of temperature the bulb will function correctly? Is there a risk of braking the bulb?

Thank you

This person living in Chicago says it made it through a subzero winter and hot summer so it looks like they are a viable option outside.