Doi Inthanon National Park is the highest mountain in Thailand with the height of 2,565meters above sea level. It is located in Chaingmai Province. The mountain (Doi in Thai Language) is largely a granite batholith intruding a southerly extension of the Shan Hills range and forming the divine between the Nam Mae Ping River to the East and the Nam Mae Chaem River to the West. Lower elevations in the most easterly part of the park are limestone formations and contain a number of caves.
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.
(Reference: http://www.chiangmai-chiangrai.com/doi_inthanon_park.html)
The summit of Doi Inthanon is in Km 48. It offers some fine views, before the dry season haze has become well established. Experience the beauty of the summit during the months of November and December. It has cold weather and high humidity throughout the year, particularly the top of the National Park.
Visitors may take pictures freely of any other subject but photographing any part of the radar station is forbidden.
Numbers of waterfalls to visit are also located in the mountain and one of the most spectacular waterfall in the North of Thailand is the Watchirathan Waterfalls.
Doi Inthanon National Park is the place to be and I was there....