Doi Inthanon National Park encompasses the highest mountain In Thailand,Located in Chiang Mai.The park covers an area of 48,240 ha. Its lowlands below 800 meters in elevation are warm and very dry during the rain-free season, but the summit of Doi Inthanon, at 2565 meters, has a climate more like Canada than Thailand. The temperature has been known to drop as low as -8 degrees C. and frosts are not unusual during the cool, dry season. January is the coldest month: an average nighttime temperature is 5.5 degrees C. At any season, Doi Inthanon is a comfortable reprieve from the heat of the lowlands. At altitudes above 1000 meters, rainfall exceeds 2500 mm, considerably more than at nearby Chiang Mai. Even in the dry season, November to April, there is rare but occasional rain or the summit may be shrouded in cloud for a part of the day; persistent mist is an important factor in the maintenance of moist forest there.