Iran has a variable climate. In the northwest, winters are cold with heavy snowfall and subfreezing temperatures during December and January. Spring and fall are relatively mild, while summers are dry and hot. In the south, winters are mild and the summers are very hot, having average daily temperatures in July exceeding 38C. On the Khuzestan plain, summer heat is accompanied by high humidity.

The official language of Iran is Persian. It is the language of government and public instruction and is the mother tongue of half of the population. Persian is spoken as a second language by a large proportion of the rest.

The rial, denoted by IRR, is the official currency of Iran. The currency officially consists of 100 dinars, however because the rial is so small in current days, no fraction of the currency is used in accounting anymore.

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The Population in Iran was reported at 74.10 millions persons in 2009, according to the International Monetary Fund (IMF). In 2015, Iran's Population is expected to be 81.92 millions persons. In 2009, Iran's economy share of world total GDP, adjusted by Purchasing Power Parity, was 1.19 percent. In 2015, Iran's share of world total GDP is forecasted to be 1.11 percent. This page includes a chart, historical data and forecast for Iran's Population.

Tehran is the capital of Iran (I.R.) and Tehran Province. With a population of 8,429,807;[3] it is also Iran's largest urban area and city, one of the largest cities in Western Asia, and is the world's 19th largest city.

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