Tehran, the capital of Islamic Republic of Iran, is situated  in the northern center of the country. It has a population  of approximately 8 million in the city and 12 million in  the larger metropolitan area. Tehran is home to diverse  ethnic and linguistic groups from all over the country  and hosts numerous international visitors. Farsi is the  dominant language spoken in Tehran.

Climate of Tehran is influenced by its geographic location, with towering Alborz Mountains to its north and  the central desert to the south. Because of significant  difference in elevation among various districts of the  capital, the weather in northern parts of the city is often  cooler than the flat southern parts. Generally, the climate  in Tehran is mild in the spring and autumn, hot and dry  in the summer and cold and wet in the winter. Summers  are usually hot and dry with little rain and low humidity. Average high temperature is between 35 and 40°C,  rarely dropping below 23°C at nights. Most of the light  annual precipitation occurs from late autumn to midspring  without a particularly wet month or season. The hottest  month is July, with an average minimum temperature of  25°C and an average maximum temperature of 38°C,  and the coldest month is January, with an average  minimum temperature of 1°C and an average maximum temperature of 9°C.

Tehran metropolis enjoys a network of highways and  interchanges which allows travelers to easily access  different parts of the city. Different types of public  transportation including subway, rapid bus transit and  taxis are available for getting around the city. Tehran  subway system, Metro, is currently one of the cleanest  train carriages and the best option during rush hours in