It does not matter if you live in a cold or hot environment you still need to hydrate. Yes someone who lives and works in the desert will require more water than someone who works in a cold environment or even indoors, but it is just as important for both people to hydrate throughout the day. In my career field many people who work in cold conditions and get sent to a desert often do not change their water intake. This leads to dehydration and if they continue to work without hydrating they may get heat exhaustion or even heat stroke. In severe cases this may lead to death. While that person is being tended to this leaves others to pick up their slack becoming fatigued and exhausted.
Water is crucial for optimal body function. Our bodies are about 80 percent water. This means that ever body cell, tissue and organ requires water to function. Water travels through your blood stream to help carry oxygen and nutrients throughout your body. Water is also needed for regulation. While working or working out being well hydrated helps you sweat and dissipate heat through your skin. This allows your body to cool itself down,