What Is the climate in western Siberian plain??

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Explanation:

In January, average temperatures range from −15 °C (5 °F) in the southwest to −30 °C (−22 °F) in the northwest. In the summer, the range is from 20 °C (68 °F) in the south to 10 °C (50 °F) in the north. Because the terrain is flat, cold air masses from the Arctic can penetrate deeply.

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pls mark brailiest