Snowing Cows and Chicken
It's raining cats and dogs because cats and dogs fight = chaos, hence the heavy 'chaos' rain. Snowing cows and chickens because cartoon 'Cow and chicken', they get along...cold and water get along = unity, hence the heavy 'unity' snow. =3
pfft! it's freezing at almost 2am, looking at pink sky - it's a blizzard, snowing cows and chicken...