The climate of Gilgit-Baltistan varies from region to region, surrounding mountain ranges creates sharp variations in weather. The eastern part has a moist zone of western Himalayas but going toward Karakoram and Hindu Kush the climate dries considerably. There are towns like Gilgit and Chilas that are very hot during the day in summer, yet cold at night, and valleys like Astore, Khaplu, Yasin, Hunza, and Nagar where the temperatures are cold even in summer.
Gilgit-Baltistan was cut off from Pakistan due to the harsh terrain and the lack of accessible roads. All of the roads to the south opened towards the Pakistani-controlled state of Azad Jammu and Kashmir (AKJ) and to the southeast towards the present-day Indian-controlled state of Jammu and Kashmir. During the summer, people could walk across the mountain passes to travel to Rawalpindi. The fastest way to travel, however, was by air, but air travel was accessible only to a few privileged local people and to Pakistani military and civilian officials. Then, with the assistance of the Chinese government, Pakistan began construction of the Karakoram Highway (KKH), which was completed in 1978. The Karakoram Highway (KKH) connects Islamabad to Gilgit and Skardu, which are the two major hubs for mountaineering expeditions in Gilgit-Baltistan. The journey from Islamabad to Gilgit takes approximately 20 to 24 hours. Landslides on the Karakoram Highway are very common. The KKH connects Gilgit to Taxkorgan [disambiguation needed] and Kashgar in China via Sust (the customs and health inspection post on the Northern Areas side) and the Khunjerab Pass, the highest paved international border crossing in the world at 4,693 metres (15,397 feet).
Northern Areas Transport Corporation (NATCO) offers bus and jeep transport service to the two hubs and several other popular destinations, lakes, and glaciers in the area.
The Karakoram Highway In March 2006, the respective governments announced that, commencing on June 1, 2006, a thrice-weekly bus service would begin across the boundary from Gilgit to Kashgar, China, and road widening work would begin on 600 kilometres of the Karakoram Highway. There would also be one daily bus in each direction between the Sust and Taxkorgan [disambiguation needed] border areas of the two political entities.
NATCO (Northern Areas Transport Corporation)
The Northern Areas Transport Corporation was established in 1974 under Companies Act 1913 with the registered office at Lahore to provide road transport system to the people of Northern Areas. In 1976 the registered office was transferred from Lahore to Islamabad with its Head office at Rawalpindi. The Government decide to shift the Head office to Gilgit dated 23-08-1977 which was not materialized till 1979. after establishment of the office of the registrar Join Stock Companies at Gilgit, NATCO was voluntarily dissolved in accordance with the provisions of Companies ordinance 1984, as per orders of the Government and Board of Directors. Accordingly it was registered with registrar Joint Stock companies Gilgit on 23rd February, 1989 under the Companies ordinance 1984. Since then the NATCO is Functioning Under the Direct Control of the Chief Secretary, Northern Areas.
Pakistan International Airlines used to fly a Fokker F27 aircraft daily between Gilgit Airport and Islamabad International Airport. The flying time was approximately 50 minutes, and the flight was one of the most scenic flights in the world, as its route passes over the mountain Nanga Parbat, the peak of which was higher than the aircraft's cruising altitude. PIA also offers regular flights of Boeing 737 between Skardu and Islamabad. However, the Fokker F27 aircraft was retired after a crash at Multan in 2006. Currently, flights are being operated by PIA to Gilgit on the brand-new ATR42-500 aircraft, which was purchased in 2006. With the new plane, the cancellation of flights is much less than it was the Fokker aircraft. All flights, however, are subject to weather clearance, and, in winter, flights are often delayed by several days.