Oklahoma has a continental climate with cold winters and hot summers. Normal daily mean temperatures in Oklahoma City range from 3°C in January to 28°C in July. The record low temperature of –33°C was set at Watts on 18 January 1930; the record high, 49°C, occurred at Tipton on 27 June 1994.

In 2000, 2,977,187 Oklahomans—92.6% of the resident population five years or older—spoke only English at home, down from 95% in 1990.

The United States dollar, denoted by USD or the symbol $, is the official currency used in the United States. Commonly referred to as the "American dollar," the currency is divided into 100 cents (symbol ˘)

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Oklahoma ranked 28th in population in the US with an estimated total of 3,493,714 in 2002, an increase of 1.2% since 2000. Between 1990 and 2000, Oklahoma's population grew from 3,145,585 to 3,450,654, an increase of 9.7%. The population is projected to reach 4.1 million by 2025.

Oklahoma City is the capital and the largest city in the state of Oklahoma. The county seat of Oklahoma County, the city ranks 31st among United States cities in population.