About Tehran (selected from Wikipedia)
Tehran is the capital of Iran and Tehran Province. With a population of around 8.4 million in the city and 15 million in the larger metropolitan area of Greater Tehran, Tehran is the most populous city in Iran and Western Asia and has the second-largest metropolitan area in the Middle East. The majority of the population of Tehran are Persian-speaking people, and roughly 99% of the population understand and speak Persian, but there are large populations of other ethno-linguistic groups who live in Tehran and speak Persian as a second language.
Tehran has an international airport Imam Khomeini Airport (IKA) with various services that is specified for international flights, a domestic airport Mehrabad Airport which is almost for domestic flights, a central railway station, the rapid transit system of Tehran Metro (including 7 lines), a bus rapid transit system, trolleybuses, and a large network of highways.
Domestic guests can easily use Tehran Metro (line 4) to transfer from Mehrabad airport to Habibollah Metro Station and walk ~200m to Sharif University of Technology. Bus and Taxi are also available at the airport.
Also, both Tehran Metro and BRT are available from Tehran railway station. Tehran Metro (line 3) from the railway station to City Theatre Station, then use BRT going to Azadi St. and get out on Sharif University of Technology Station.
For international guests, we recommend to use Tehran Metro (line 1) from IKA airport to station Emam Khomeini which is a cross-station between Line 1 and 2, then switch to Line 2 (on the direction of Sadeghiyeh) and get out on Sharif station.
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Tehran features a cold semi-arid climate with continental climate characteristics and a Mediterranean climate precipitation pattern. Tehran's climate is largely defined by its geographic location, with the towering Alborz mountains to its north and the country's central desert to the south. It can be generally described as mild in spring and autumn, hot and dry in summer, and cold and wet in winter.
Summer is long, hot, and dry with little rain, but relative humidity is generally low, making the heat tolerable. Average high temperatures are between 32 and 41 °C (90 and 106 °F), and it can drop to 14 °C in the mountainous north of the city at night. Most of the light annual precipitation occurs from late autumn to mid-spring, but no one month is particularly wet. The hottest month is July, with a mean minimum temperature of 33 °C (91 °F) and a mean maximum temperature of 38 °C (100 °F), and the coldest is January, with a mean minimum temperature of −5 °C (23 °F) and a mean maximum temperature of 1 °C (34 °F).
The weather of Tehran can sometimes be unpredictably harsh. The record high temperature is 43 °C (109 °F) and the record low is −20 °C (−4 °F). On January 5 and 6, 2008, a wave of heavy snow and low temperatures covered the city in a thick layer of snow and ice, forcing the Council of Ministers to officially declare a state of emergency and close down the capital on January 6 and 7.