Question

why our urine is pale in colour in winter season more than summer season?

Answer 1

complete information about urine colour
refer to this it is very informative

Clear or light yellow
This is an ideal urine color. If you see very light yellow or clear urine, it means you are very well hydrated and the body is functioning the way it should be. This usually happens when a person drinks lots of water. 

Yellow 
If you see plain yellow urine, it means your body is not very well hydrated. It could be due to excessive sweating or low hydration. Hence, it indicates that you should be drinking more of liquids to avoid dehydration.

Dark yellow
Due to intake of some medications, your urine may turn dark yellow. If you notice this color, then seek medical assistance immediately, because it is a sign of medical problems like liver disorders and hepatitis. 

Milky-white
This color is due to growth of bacteria in the urinary tract. It indicates urinary tract infection or presence of kidney stones. 

Answer 2

Normal urine is either colourless or pale yellow coloured containing uric acid. People may also make more urine in the winter as in the summer bcoz in warm weather they do not release as much water through perspiration etc as we would in summer season