The clouds rolled in and the temperature dropped about four days ago. At this time of year, gray, flat, overcast weather like this can last for days at a time, with or without rain. The temperature hovers just above 70 in the day and drops into the 60s at night. For Vietnamese used to nine months or so of hot, mostly sunny days, it feels downright cold. Yesterday, blustery 20 to 30mph winds made it feel pretty chilly out at the beach. This is looking north across Da Nang Bay at the mountains that separate Da Nang from Hue about 80km to the north. The Hai Van Pass that goes over the mountains is covered by clouds.