Because they come across the Atlantic, and are heavily charged with vapour.
386. Why are north winds generally cold and dry?
Because they come from the arctic ocean, over vast areas of ice and snow.
"Terrors are turned upon me: they pursue my soul as the wind; and my welfare passeth away as a cloud."—Job xxx.
387. Why are south winds warm and rainy?
Because they come from the southern regions, heated by the hot earth and sands, and as they cross the sea they absorb a large amount of vapour.