Karaj's climate is a bit cooler than Tehran and it receives 260 mm of rain annually.The economical base for Karaj is its proximity to Tehran, where transportation of products between the capital and the Caspian Sea is central.
At the 2006 census, its population was 1,377,450, in 385,955 families, making it the fifth-largest city in Iran.Chemicals, fertilizers and processed agricultural goods are also produced here. Many of the most important factories of Iran are located near it.Karaj is a multicultural city, due to migrants from all around Iran, that is why Karaj is called as Little Iran. Karaj (Persian: كرج pronounced ) is a city in and the capital of Karaj County, Alborz Province, Iran.The Soleimanieh palace (currently housing a college of Agriculture), the mausoleum of Shahzadeh Soleiman, Imamzadeh Rahman and Zeid Palang Abad-e-Eshtehard are other historical relics of the Karaj area.During the Pahlavi dynasty era, the Morvarid Palace was constructed in nearby Mehrshahr district, designed by the Frank Lloyd Wright Foundation.
People are very nice to foreigners and most of them get very happy to drive you between the two cities.