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There are high-speed winds in the thinner upper cloud layers, which increase in speed in the middle layers. These winds blow from west to the east. The upper winds have a speed of around 300 km/hour, and middle layer winds (the equivalent of Earth's jet streams) move at up to 700 km/hour (435 mph). But in the thicker lower layers, this slows to only a few kilometers per hour.

For example, on October 23, 1975, the Soviet lander, Venera 10, measured a wind speed of 3.5 meters/second or about 8 mph at the surface.

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13y ago

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