The most cold and rainy months to visit Petra are December and January. In this time it is warm during the day and very cold in the evenings and at nights. That's why it is necessary to take coats, hats and gloves. And it could warm up your visit there if you take a thermos with hot tea with you. Avoid going if the forecast shows a lot of rain, as the guards may need to transport tourists out if the valley starts to flood like on Jan 18th 2010. The hot, dry air sometimes results in nosebleeds. Carry petroleum jelly Vaseline or other brands or petroleum jelly based products like Vicks and apply liberally to the insides of the nostrils to avoid nosebleeds. Also, carry plenty of water and Oral Rehydration products like Electral if you are traveling to Petra in the hot summer months to avoid dehydration. A good cap and sunglasses will help you avoid getting a heat stroke.
