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