Just as soon as its temperature has dropped to 32 degrees (Fahrenheit, or 0° Celsius),
and the heat of fusion has leaked out of it, it solidifies, I guarantee.
It doesn't freeze - one use of anti-freeze is in your cars radiator it stops it from freezing up in the winter, no anti freeze and you run the risk of a frozen radiator, car over heating or even worse a cracked engine block.
At least 12 hours
-12 degrees in the water and -4 in the land
It drops to about 12 degrees Fahrenheit.
12 degrees Celsius
12 degrees Celsius
The tropics
As much as you want, fasting refers to food not water.
There's no significant body of water there. That point is on land in Nicaragua, about 23 miles southeast of Managua.
Cold. Below the freezing point of water.
20° F is 12 Fahrenheit degrees and (6 and 2/3) Celsius degrees colder than the freezing point of water.
-12 degrees Fahrenheit = -24.4 degrees Celsius.