History: Old Iraq

With its 143.1 billion barrels (2.275×1010 m3) of proved oil reserves, Iraq ranks second in the world behind Saudi Arabia in the amount of Oil reserves; yet the United States Department of Energy estimates that up to 90% of the country remains unexplored. These regions could yield an additional 100 billion barrels (1.6×1010 m3). Iraq's oil production costs are among the lowest in the world, but only about 2,000 oil wells have been drilled in Iraq, compared with about 1 million wells in Texas alone.
Climate
Most of Iraq has a hot arid climate with subtropical influence. Summer temperatures average above 40 °C (104 °F) for most of the country and frequently exceed 48 °C (118.4 °F). Winter temperatures infrequently exceed 21 °C (69.8 °F) with maximums roughly 15 to 19 °C (59 to 66.2 °F) and night-time lows 2 to 5 °C (35.6 to 41 °F). Typically precipitation is low; most places receive less than 250 mm (9.8 in) annually, with maximum rainfall occurring during the winter months. Rainfall during the summer is extremely rare, except in the far north of the country.