Compared to other cities of the country, Islamabad is a clean, spacious and quiet city with lots of greeneries. The site of the city has a history going back to the earliest human habitations in Asia. This area has seen the first settlement of Aryans from Central Asia, ancient caravans passing from Central Asia, and the massive armies of Tamerlane and Alexander.
The area of Islamabad is 906.50 square kilometres. A further 3626 square kilometres area is known as the Specified Area, with the Margala Hills in the north and northeast.
Islamabad city is divided into five major zones: Zone I, Zone II, Zone III, Zone IV, & Zone V. Zone IV is the largest in area while Zone I is the largest developed residential area. Zone 1 is divided into sectors. Each residential sector is identified by a letter of the alphabet and a number, and covers an area of approximately 2 km × 2 km.
Islamabad features an atypical version of a humid subtropical climate, with hot, humid summers accompanied by a monsoon season followed by cool winters.
Average yearly rainfall 1143 millimeters.
Average yearly humidity: 55%