There is probably not much of a difference. However, if there is a difference, black fur would keep you warmer because black objects absorb radiant heat (such as the heat from the sun), and white objects bounce radiant heat off.
put a blanket on 'em. gosh.
You can insulate your home to keep it warmer in winter and colder in summer.
stay inside and feathers keep them even warmer
Thick walls and small windows keep the house cooler in summer and warmer in winter.
Because wool clothes are heavier, thus making them warmer.
blue hat would keep you warmer because the sun attracts to darker colors
they have layers of black and white feathers to keep them warm
white
They have a thick coat in winter for keeping itself warm but in Spring and Summer it sheds its fur for adjusting to the warmer season.
Heavier humans have more body fat therefore produce heat to keep themselves warm.
Thick walls help keep the house cooler in summer and warmer in winter.
In Black, White, Black 2 and White 2, you cannot keep a Pokémon outside of its Poké Ball.