Acording to Wikipedia, Winter in Dubai begins around the last week of October and lasts until the beginning of April. The winter season has the most pleasant weather, making it ideal for outdoor activities. Most of the precipitation takes place during this season.
Wikipedia has it right, as over the past week we have had two torrential downpours that resulted in the usual flooded streets. Despite the downpours, the cooler temps are a welcome break from the usual heat. Long may it continue.