Hailstorms, Wacky Weather Chilled Ancient Baghdad

http://www.livescience.com/18650-weird-weather-ancient-baghdad.html

Domínguez-Castro and his colleagues collected and analyzed these documents and found that they revealed a pattern of increasing frequency of cold-weather events in the early 10th century. July A.D. 920 was unusually cold, perhaps because of a volcanic eruption, Domínguez-Castro said. It snowed in Baghdad in 908, 944 and 1007. The only snow in living memory in the city was in 2008.