No, because they will freeze to death
Yes, because 30 degrees is below freezing.
Any temperature near or below freezing for several hours can be harmful. In cold weather, dogs should be provided warm shelter, at least, and heated accommodations when the temperature (or wind chill) is near freezing.
Warmly. That's below freezing.
In the winter, when the temps go below freezing, there should not be any water in a car. It should be antifreeze, actual windshield wiper fluid, etc.... This will prevent any freezing.
The outside temperature gauge says ICE this morning (AM) because it may be icy outside. Also, the temperature outside may be below 32 degrees, which is freezing temperatures.
Well it won't work below freezing.
It is generally considered too cold to work outside when the temperature drops below freezing (32F or 0C) or when there is a risk of frostbite or hypothermia.
The outside water is typically shut off for the winter season before temperatures drop below freezing to prevent pipes from freezing and bursting. It is usually done in late fall or early winter.
You should worry about pipes freezing when temperatures drop below 32 degrees Fahrenheit, especially if the pipes are not insulated or exposed to cold air.
Since +32F is freezing, -20 F is 52 degrees Fahrenheit below freezing.
In Fahrenheit: 35 degrees below freezingIn Celsius, 3 degrees below freezing.(In both cases, we're using "freezing" to meanthe freezing temperature of water.)
Heat pumps can still work below freezing temperatures by using a backup heating source, such as electric resistance heating, to provide warmth when the outside air is too cold for the heat pump to efficiently extract heat.