enjoying coffee in an outdoor cafe, many without jackets. in valencia at 19 degrees celsius, it s nearly beach weather. translator: it s marvelous. at this time of year toen joy the beach. reporter: moscow s red square without snow, the christmas there was anything but white. green slopes in germany s ski resorts forced people into more year around attractions like the alpine sled run. translator: there are people who come to go skiing, so some are saying this is not ideal weather, but a lot of people are familiar with the surrounding and find other activities. reporter: but why is this happening? meteorologists are chalking it up to el niño. it occurs when ocean temperatures in the pacific are unusually high. the warm water changes weather patterns all over the world.