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Irkutsk Oblast

First-level administrative division of Russia

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  • 5 chapters

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Through Precipitation and Summer

Geography

Irkutsk Oblast borders the Republic of Buryatia and the Tuva Republic in the south and southwest, which separate it from Khövsgöl Province, Mongolia; Krasnoyarsk Krai in the west; the Sakha Republic in the northeast; and Zabaykalsky Krai in the east.

Lake Baikal, the oldest and deepest lake in the world (containing over a fifth of Earth's fresh liquid surface water), is located in the southeast of the region. It is drained by the Angara, which flows north across the province; the outflow rate is controlled by the Irkutsk Dam. The two other major dams on the Irkutsk Oblast's section of the Angara are at Bratsk and Ust-Ilimsk; both forming large reservoirs. The Lena has its source in Irkutsk Oblast as well, and flows north-east into the neighboring Sakha Republic.

Irkutsk Oblast consists mostly of the hills and broad valleys of the Central Siberian Plateau, with the Lena-Angara Plateau. The Primorsky Range and the Baikal Mountains stretch along Lake Baikal, and in the northeast rise the North Baikal Highlands and the Patom Plateau. Pik Tofalariya is the highest point of the oblast.

Climate

The climate varies from warm summer continental in the south to continental-subarctic in the northern part (Köppen climate classification: Dwc). For almost half the year, from mid-October until the beginning of April, the average temperature is below 0 °C (32 °F). Winters are very cold, with average high temperatures in Irkutsk of −14.9 °C (5.2 °F) and average lows of −25.3 °C (−13.5 °F) in January. Summers are warm but short: the average high in July is +24.5 °C (76.1 °F) and the average low is +11.2 °C (52.2 °F). However, by September, the weather cools down significantly to an average daily high of +15.3 °C (59.5 °F) and an average daily low of +2.5 °C (36.5 °F). More than half of all precipitation falls in the summer months, with the wettest month being July, with 96.2 millimeters (3.79 in) of rain. January is the driest month, with only 11 millimeters (0.43 in) of precipitation. Annual precipitation averages 419.8 millimeters (16.53 in).

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